LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0971 >> DTC P0218 >> Diagnostic Fault Information

Diagnostic Fault Information

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 - poor 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
Heat transfer:
  • Engine overheating
  • 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 cooler lines.
P0218
Transmission Abuse:
  • Engine overheating
  • Excessive brake torque maneuvers
  • Vehicle overloaded
  • Vehicle is towing beyond capacity
  • Vehicle modifications
P0218
Vehicle Damage:
  • Damage to vehicle under carriage
  • Transmission bottom pan damage
  • Restricted air flow
P0218
Transmission Fluid:
  • Fluid leaks
  • Low fluid level
  • Contaminated or poor fluid quality
P0218
Torque Converter:
  • Inefficient pump
  • Torque converter failure - stator, pump, clutch, ballooning or heat damaged
  • Stuck on or locked up
  • Converter damage
P0218
Low Pump Output:
  • Low fluid level
  • Blocked, damaged or loose filter
  • Pinched or restricted cooler lines
  • Restricted cooler - damage or debris
  • Inefficient pump - worn
P0218
Clutch Slippage:
  • Low fluid level
  • Low Pump Output
P0218