U0425
Invalid Data Received From Auxiliary Heater Control Module
U0425 is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Auxiliary Heater Control Module. Common causes: malfunction of the additional heater control module, damage to the wiring harness to the heater. Estimated repair cost: $56–167.
Symptoms
- Auxiliary heater does not work
- Error message on the dashboard
- Reduced interior heating efficiency
- Problems starting the engine in cold weather (for diesel engines)
Causes
- Malfunction of the additional heater control module
- Damage to the wiring harness to the heater
- Poor contact in connectors
- Software error in the ECU
- Heater module power supply problems
How to Fix
- Check the integrity of the wiring harness to the heater
- Check connections and contacts in connectors
- Test the heater control module
- Update ECU software
- Replace the control module if necessary
Related codes
Error U0425 by Vehicle Brand
FAQ
What does the U0425 code mean?
U0425 is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Auxiliary Heater Control Module
What causes a U0425 error code?
The most common causes of U0425 include: Malfunction of the additional heater control module; Damage to the wiring harness to the heater; Poor contact in connectors; Software error in the ECU.
How do I fix a U0425 diagnostic trouble code?
To fix U0425: Check the integrity of the wiring harness to the heater. Check connections and contacts in connectors. Test the heater control module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0425?
Yes, but get it checked soon
How much does it cost to fix U0425?
The estimated repair cost for U0425 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat