B1042
Diagnosis Sensor Unit
B1042 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: damage to the harness for the passive restraint system, malfunction of the diagnostic unit (diagnosis sensor unit). Estimated repair cost: $56–167.
Symptoms
- Airbag light is on
- The passive safety system does not pass self-diagnosis
- Lack of system response in case of an accident (in extreme cases)
Causes
- Damage to the harness for the passive restraint system
- Malfunction of the diagnostic unit (Diagnosis Sensor Unit)
- Corrosion or oxidation of contacts
- Damage to squibs or shock sensors
- Control unit software failure
How to Fix
- Check the wiring harness for damage and corrosion.
- Scan the system for additional errors
- Check the power and ground of the diagnostic unit
- Replace the faulty diagnostic unit if necessary
- Reset the error and check for reappearance
Related codes
FAQ
What does the B1042 code mean?
B1042 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit
What causes a B1042 error code?
The most common causes of B1042 include: Damage to the harness for the passive restraint system; Malfunction of the diagnostic unit (Diagnosis Sensor Unit); Corrosion or oxidation of contacts; Damage to squibs or shock sensors.
How do I fix a B1042 diagnostic trouble code?
To fix B1042: Check the wiring harness for damage and corrosion.. Scan the system for additional errors. Check the power and ground of the diagnostic unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1042?
Do not drive — repair immediately
How much does it cost to fix B1042?
The estimated repair cost for B1042 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat