P0653
Sensor Reference Voltage B Circuit High
P0653 is an OBD-II diagnostic trouble code meaning: Sensor Reference Voltage B Circuit High. Common causes: short circuit of reference voltage wire b to power wire (12 v), ecu reference voltage regulator internal fault. Estimated repair cost: $22–667.
Symptoms
- Check Engine light comes on
- Several sensor codes with inflated values
- Engine emergency mode
- Incorrect mixture formation (rich mixture)
- Possible damage to sensors due to overvoltage
Causes
- Short circuit of reference voltage wire B to power wire (12 V)
- ECU reference voltage regulator internal fault
- Wiring harness insulation damage
- Incorrect connection after repair
- Faulty sensor with a short to positive (rare)
How to Fix
- Check voltage at circuit B sensor reference pins
- Check voltage reference wire B for short to power.
- Inspect the wiring harness for insulation damage
- Disconnect the sensors one at a time and check the voltage change
- If the external wiring is in good working order - diagnostics of the ECU on the bench
- If necessary, repair or replace the ECU
Related codes
Error P0653 by Vehicle Brand
FAQ
What does the P0653 code mean?
P0653 is an OBD-II diagnostic trouble code that indicates: Sensor Reference Voltage B Circuit High
What causes a P0653 error code?
The most common causes of P0653 include: Short circuit of reference voltage wire B to power wire (12 V); ECU reference voltage regulator internal fault; Wiring harness insulation damage; Incorrect connection after repair.
How do I fix a P0653 diagnostic trouble code?
To fix P0653: Check voltage at circuit B sensor reference pins. Check voltage reference wire B for short to power.. Inspect the wiring harness for insulation damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0653?
Yes, but get it checked soon
How much does it cost to fix P0653?
The estimated repair cost for P0653 is $22–667. Actual cost depends on your vehicle, location, and labor rates.
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