Diagnostic Fault Information
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
| Component |
Cause |
DTCs |
| Engine |
- Engine coolant level low
- Incorrect engine coolant
- Old coolant or incorrect concentration level
- Cooling system leak
- Radiator hose kinked or pinched
- Loose, missing, or damaged radiator air seals or deflector - restricted air flow
- The radiator and A/C condenser has air flow obstructions to include large amount of bent fins
- The cooling fans do not operate
- Inspect the engine mechanical for worn, leaking, cracked cylinder heads, or engine block
|
P1258 |
| Transmission |
Vehicle Overload or Beyond Capacity Towing:
- Vehicle is overloaded
- Vehicle is towing beyond capacity
- Towing in wrong gear
- Vehicle modifications
|
P0218
P0634 |
Heat Transfer:
- Cooler restrictions - radiator has restricted flow/blockage
- Restricted air flow
- Vehicle modifications
- Aftermarket auxiliary cooler installed incorrectly, incorrect flow direction - reversed flow
- Restricted, blocked, or pinched transmission fluid cooler pipes.
- Stuck open or stuck closed transmission fluid cooler pipe thermostat
|
P0218
P0634 |
Transmission Abuse:
- Vehicle overloaded
- Vehicle is towing beyond capacity
- Vehicle modifications
|
P0218
P0634 |
Vehicle Damage:
- Transmission bottom pan damage
- Restricted air flow
|
P0218
P0634 |
Transmission Fluid:
- Fluid leaks
- Low fluid level
- Contaminated or poor transmission fluid quality
|
P0218
P0634 |
Low Fluid Pump Output:
- Blocked, damaged or loose filter
- Pinched or restricted transmission fluid cooler pipes
- Restricted cooler - damage or debris
- Inefficient pump - worn
|
P0218
P0634 |
Clutch Slippage:
- Low fluid level
- Low Fluid Pump Output
- Damaged or leaking clutch seals
- Internal hydraulic leak
- Worn clutch plate assembly
|
P079A
P079B
P079C
P079D |