U0691
Lost Communication With Exhaust Pressure Sensor A
U0691 is an OBD-II diagnostic trouble code meaning: Lost Communication With Exhaust Pressure Sensor A. Common causes: open or short circuit in the sensor circuit, poor contact in the sensor connector. Estimated repair cost: $33–89.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Problems with the exhaust gas recirculation (EGR) system
- Possible errors in pressure in the exhaust system
Causes
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Malfunction of the exhaust gas pressure sensor
- Problems with power or grounding of the sensor
- Engine control unit (ECU) malfunction
How to Fix
- Check the integrity of the wiring to the sensor
- Inspect and clean the contacts in the sensor connector
- Check the power supply and grounding of the sensor
- Replace exhaust gas pressure sensor if necessary
- Check and update the control unit software if necessary
Related codes
Error U0691 by Vehicle Brand
FAQ
What does the U0691 code mean?
U0691 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Exhaust Pressure Sensor A
What causes a U0691 error code?
The most common causes of U0691 include: Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Malfunction of the exhaust gas pressure sensor; Problems with power or grounding of the sensor.
How do I fix a U0691 diagnostic trouble code?
To fix U0691: Check the integrity of the wiring to the sensor. Inspect and clean the contacts in the sensor connector. Check the power supply and grounding of the sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0691?
Yes, but get it checked soon
How much does it cost to fix U0691?
The estimated repair cost for U0691 is $33–89. Actual cost depends on your vehicle, location, and labor rates.
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