U02A9 on 2008-2023 Dodge Challenger (SXT, GT, R/T, R/T Scat Pack, SRT 392, SRT Hellcat, SRT Hellcat Redeye) — Lost Communication With Charge Air Cooler Coolant Pump "A"
1 vehicles · 1 makes · $140-$1,200 repair
Most Reported On
U02A9 is an OBD-II diagnostic trouble code meaning “Lost Communication With Charge Air Cooler Coolant Pump "A".” A generic network/communication code for vehicles using a liquid-to-air charge air cooler with its own electrically driven, module-controlled coolant pump. It is documented by GM (for example on the 3.0L Duramax diesel, TSB 23-NA-102) and is also commonly reported on supercharged Stellantis SRT models (Charger/Challenger Hellcat). The code sets when the controlling module stops receiving valid messages from the charge air cooler coolant pump — often over the LIN bus, so it may appear with U1345 (LIN bus failure). Because the pump circulates coolant through the intercooler, a genuine loss of pump function means rising intake air temperatures and reduced power under load. It is frequently reported alongside P023B (charge air cooler coolant pump control circuit) and is usually an electrical/connector path problem rather than a dead pump. This code is most commonly reported on 2008-2023 Dodge Challenger (SXT, GT, R/T, R/T Scat Pack, SRT 392, SRT Hellcat, SRT Hellcat Redeye), with repair costs ranging from $140 to $1,200.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U02A9.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does U02A9 mean?
U02A9 stands for "Lost Communication With Charge Air Cooler Coolant Pump "A"." A generic network/communication code for vehicles using a liquid-to-air charge air cooler with its own electrically driven, module-controlled coolant pump. It is documented by GM (for example on the 3.0L Duramax diesel, TSB 23-NA-102) and is also commonly reported on supercharged Stellantis SRT models (Charger/Challenger Hellcat). The code sets when the controlling module stops receiving valid messages from the charge air cooler coolant pump — often over the LIN bus, so it may appear with U1345 (LIN bus failure). Because the pump circulates coolant through the intercooler, a genuine loss of pump function means rising intake air temperatures and reduced power under load. It is frequently reported alongside P023B (charge air cooler coolant pump control circuit) and is usually an electrical/connector path problem rather than a dead pump.
What are the most common causes of U02A9?
The most common causes of U02A9 are: Unsealed, wet, or corroded connector at the charge air cooler coolant pump (a documented GM failure mode — water intrusion into the pump connector), Damaged or chafed wiring, including harness contacting the radiator, Blown fuse or failed relay in the pump module's power feed, Poor or corroded ground causing intermittent dropout under heat and vibration, LIN/serial data bus fault between the pump module and the controlling module, Failed charge air cooler coolant pump module. The specific cause varies by vehicle.
How much does it cost to fix U02A9?
Repair costs for U02A9 range from $140 to $1,200, depending on the vehicle and root cause.
Which vehicles are affected by U02A9?
Au7o has documented U02A9 across 1 vehicle models from 1 manufacturers: Dodge.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.