hobbz

Up until a few days ago my grid heater/wait to start light would stay on for 3 to 5 seconds and then would go out.

The past week or so, the light has not been staying on for the normal 3 to 5 seconds.

Yesterday, 28F outside, truck sitting for 8 hours. I get in to go home from work and the grid heater light just came on for a second like all the other lights and then shut off. I started the truck, took a little longer than normal, and was letting it idle for about 5 minutes in Hi-Idle before I left for home.

The grid heater light never came on or anything, but the lights would get brighter and the engine surge like the grid heater was cycling.

But shouldn't the lights dim, not brighten?

Also once or twice the brake light(above the grid heater light) flickered and I got a ding.

What could the problem be? To me it sounds like the heater may be shorting out.

Thanks for any help...

hobbz

Just looked at the codes, and the only thing that i saw was "battery temp sensor something"... I cleared it and it is still gone...

I did the key cycle 3 times and got P0595

I did the key on with reset button held and got:
A7 50
AA 51
68 01

Does anyone know what those mean?

Any help would be appreciated???

bsg800

You can do a C code search on here for dash diagnostics,the codes you have come up as A7 Vin check sum error,AA PCM message not recieved,68 driver door unlock output circuit shorted to ground or voltage I dont know what the #'s are after they only come up as A7,AA,68 good luck sounds like a short somewhere

hobbz

what exactly did you search for? i can't find what you are talking about???

hobbz

I found a list of codes in my manual.

the code 68 has me wondering because I don't have power windows or locks.....

bsg800

Maybe this will help these are the P&C codes for 03to 04 maybe the same for 04.5 the first 2 numbers or letters for C are the code the second set of numbers is the number of times it has set it

Engine Systems "P" Codes

P0016 Crankshaft/Camshaft Timing Misalignment/Out-of-Sync
P0071 Ambient Temperature Sensor Performance / Rationality
P0072 Ambient Temperature Sensor Low
P0073 Ambient Temperature Sensor High
P0088 Fuel Rail Pressure Too High
P0106 Manifold Absolute Pressure Sensor Performance / Rationality
P0107 Manifold Absolute Pressure Sensor Low
P0108 Manifold Absolute Pressure Sensor High
P0111 Intake Air / Charge Temperature Sensor Performance / Rationality
P0112 Intake Air / Charge Temperature Sensor Low
P0113 Intake Air / Charge Temperature Sensor High
P0116 Engine Coolant Temperature Sensor Performance / Rationality
P0117 Engine Coolant Temperature Sensor Low
P0118 Engine Coolant Temperature Sensor High
P0128 Cooling System Error / Thermostat Rationality
P0148 Fuel Delivery Error
P0169 Water-in-Fuel Detected For Too Long
P0192 Fuel Rail Pressure Sensor Low
P0193 Fuel Rail Pressure Sensor High
P0201 Fuel Injector 1 Circuit
P0202 Fuel Injector 2 Circuit
P0203 Fuel Injector 3 Circuit
P0204 Fuel Injector 4 Circuit
P0205 Fuel Injector 5 Circuit
P0206 Fuel Injector 6 Circuit
P0217 Coolant Temperature Too High
P0219 Engine Overspeed
P0234 Turbocharger Overboost Condition
P0236 Turbocharger Boost Pressure Sensor Performance / Rationality
P0237 Turbocharger Boost Pressure Sensor Low
P0238 Turbocharger Boost Pressure Sensor High
P0251 Injection Pump Fuel Valve Feedback
P0300 Multiple Cylinder Misfire
P0301 Cylinder 1 Misfire
P0302 Cylinder 2 Misfire
P0303 Cylinder 3 Misfire
P0304 Cylinder 4 Misfire
P0305 Cylinder 5 Misfire
P0306 Cylinder 6 Misfire
P0335 Crankshaft Position Sensor Circuit
P0336 Crankshaft Position Sensor Performance
P0337 Crankshaft Position Sensor Circuit Low
P0338 Crankshaft Position Sensor Circuit High
P0340 Camshaft Position Sensor Circuit
P0341 Camshaft Position Sensor Performance / Rationality
P0381 Wait-to-Start Lamp Inoperative
P0461 Fuel Level Sensor 1 Performance / Rationality
P0462 Fuel Level Sensor 1 Low
P0463 Fuel Level Sensor 1 High
P0477 Exhaust Pressure Control Relay Low
P0478 Exhaust Pressure Control Relay High
P0480 Cooling Fan 1 Control Circuit/Open (Low Speed Fan Relay)
P0483 Cooling Fan Speed
P0500 Vehicle Speed Sensor 1 Circuit, or No Vehicle Speed Reference Signal 1
P0514 Battery Temperature Sensor Performance / Rationality
P0516 Battery Temperature Sensor Low
P0517 Battery Temperature Sensor High
P0521 Oil Pressure Sensor Performance / Rationality
P0524 Oil Pressure Too Low
P0532 A/C Pressure Sensor Low
P0533 A/C Pressure Sensor High
P0541 Intake Air Heater Relay 1 Low
P0542 Intake Air Heater Relay 1 High
P0562 Battery Voltage Low
P0563 Battery Voltage High
P0572 Brake Switch 1 Low
P0573 Brake Switch 1 High
P0580 Speed Control Multiplexed Switch 1 Low
P0581 Speed Control Multiplexed Switch 1 High
P0602 Control Module Programming Error/NotProgrammed
P0604 Internal Control Module RAM Integrity Failure
P0606 Internal ECM Processor
P0607 ECU Internal Performance
P0622 Generator Field Control Circuit
P0628 Fuel Pump Relay Circuit Low, or Fuel Lift Pump Control Circuit Low
P0629 Fuel Pump Relay Circuit High, or Fuel Lift Pump Control Circuit High
P0630 VIN Not Programmed in PCM
P0633 SKIM Key Not Programmed in PCM
P0642 Sensor Reference Voltage 1 Circuit Low
P0643 Sensor Reference Voltage 1 Circuit High
P0646 A/C Clutch Relay Circuit Low
P0647 A/C Clutch Relay Circuit High
P0652 Sensor Reference Voltage 2 Circuit Low
P0653 Sensor Reference Voltage 2 Circuit High
P0698 Sensor Reference Voltage 3 Circuit Low
P0699 Sensor Reference Voltage 3 Circuit High
P0700 Transmission Control System (MIL Request)
P0837 Four Wheel Drive (4WD) Switch Performance / Rationality
P0838 Four Wheel Drive (4WD) Switch Circuit Low
P0839 Four Wheel Drive (4WD) Switch Circuit High
P1652 J1850 Communication Bus
P2121 Pedal Position Sensor 1 Performance / Rationality
P2122 Pedal Position Sensor 1 Low
P2123 Pedal Position Sensor 1 High
P2127 Pedal Validation Switch 2 Low
P2128 Pedal Validation Switch 2 High
P2146 Fuel Injector Group 1 Supply Voltage Circuit
P2149 Fuel Injector Group 2 Supply Voltage Circuit
P2266 Water in Fuel Sensor Circuit Low
P2269 Water in Fuel Condition
P2502 Charging System Output Voltage
P2503 Charging System Output Low
P2504 Charging System Output High
P2509 ECM/PCM Power Input Signal Intermittent
P2607 Intake Air Heater Relay 2 Low
P2608 Intake Air Heater Relay 2 High
P2609 Intake Air Heater System Performance


Instrument Cluster "C" Codes

01 Airbag warning indicator output circuit shorted. Refer to the appropriate
diagnostic information.
02 Airbag warning indicator output circuit open. Refer to the appropriate
diagnostic information.
03 ABS indicator output circuit shorted. Refer to the appropriate diagnostic
information.
04 ABS indicator output circuit open. Refer to the appropriate diagnostic
information.
05 MIL indicator output circuit shorted. Refer to the appropriate diagnostic
information.
06 MIL indicator output circuit open. Refer to the appropriate diagnostic
information.
07 Wait to start indicator circuit shorted. Refer to the appropriate
diagnostic information.
08 Wait to start indicator circuit open. Refer to the appropriate diagnostic
information.
0B BTSI output circuit shorted or open. Refer to the appropriate diagnostic
information.
22 Headlamp switch input circuit shorted. Refer to the appropriate
diagnostic information.
23 Headlamp switch input circuit open. Refer to the appropriate diagnostic
information.
24 Turn hazard switch input circuit shorted. Refer to the appropriate
diagnostic information.
25 Turn hazard swiitch inpot circuit open. Refer to the appropriate
diagnostic information.
27 Courtesy/dome output circuit shorted or open. Refer to the appropriate
diagnostic information.
28 Glovebox/map lamp output circuit shorted or
open.
Refer to the appropriate diagnostic information.
29 Cargo lamp output circuit shorted or open. Refer to the appropriate
diagnostic information.
40 Wiper switch input circuit shorted. Refer to the appropriate diagnostic
information.
41 Wiper switch input circuit open. Refer to the appropriate diagnostic
information.
42 Wash/beam input circuit shorted. Refer to the appropriate diagnostic
information.
60 Passenger door lock switch input circuit
shorted.
Refer to the appropriate diagnostic information.
61 Passenger door lock switch input circuit open. Refer to the appropriate
diagnostic information.
62 Passenger door lock switch input circuit stuck. Refer to the appropriate
diagnostic information.
63 Driver door lock switch input circuit shorted. Refer to the appropriate
diagnostic information.
64 Driver door lock switch input circuit open. Refer to the appropriate
diagnostic information.
65 Driver door lock switch input circuit stuck. Refer to the appropriate
diagnostic information.
66 All door lock output circuit shorted to ground
or voltage.
Refer to the appropriate diagnostic information.
67 All door unlock output circuit shorted to
ground or voltage.
Refer to the appropriate diagnostic information.
68 Driver door unlock output circuit shorted to
ground or voltage.
Refer to the appropriate diagnostic information.
6C Driver cylinder lock switch input circuit
shorted.
Refer to the appropriate diagnostic information.
6E Driver cylinder lock switch input circuit stuck. Refer to the appropriate
diagnostic information.
80 Incorrect odometer value found. Refer to the appropriate diagnostic
information.
81 Remote radio switch input circuit high. Refer to the appropriate
diagnostic information.
82 Remote radio switch stuck. Refer to the appropriate diagnostic
information.
A0 Internal module FLASH memory checksum
failure.
Refer to the appropriate diagnostic information.
A1 Internal module bootloader failure. Refer to the appropriate diagnostic
information.
A3 Battery voltage open. Refer to the appropriate diagnostic information.
A5 TCCM messages not received. Refer to the appropriate diagnostic
information.
A7 VIN checksum error. Refer to the appropriate diagnostic information.
A8 VIN previously stored. Refer to the appropriate diagnostic information.
A9 PCI bus internal failure. Refer to the appropriate diagnostic
information.
AA PCM messages not received. Refer to the appropriate diagnostic
information.
AB TCM messages not received. Refer to the appropriate diagnostic
information.
AC ABS messages not received. Refer to the appropriate diagnostic
information.
AD FCM messages not received. Refer to the appropriate diagnostic
information.
AE ACM messages not received. Refer to the appropriate diagnostic
information.
AF SKIM messages not received. Refer to the appropriate diagnostic
information.
B0 RKE fob batteries low. Refer to the appropriate diagnostic information.
B1 RKE module communication link. Refer to the appropriate diagnostic
information.
00 Done All Diagnostic Trouble Codes (DTC) have been
displayed.