Network
generic / SAE
U02A9
Lost Communication With Charge Air Cooler Coolant Pump A
The vehicle bus reports loss of communication with charge air cooler (intercooler) coolant pump A. Intake-charge cooling on indirect intercooler systems cannot be controlled, raising knock risk and reducing power.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number2 / A9
Possible causes
- Bus wiring open or shorted high
- Module without power or ground medium
- Module failed medium
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 0.5–3 h
- Component: cac coolant pump a
- Component: vehicle bus wiring
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012