U0134 code meaning
Lost Communication With Power Steering Control Module - Rear
What U0134 means
U0134 is stored when a controller loses contact with the rear power steering control module, the actuator unit of a rear-wheel or four-wheel steering system. Such systems turn the rear wheels by a few degrees, opposite to the front ones at low speed for a smaller turning circle and in the same direction at higher speed for calmer lane changes. No manufacturer explains U0134 in a publicly available document. CARB obliges manufacturers to detect missing communication from digital inputs as a separate fault, while electronic steering only falls under OBD monitoring where other diagnostics depend on it, so the code is mainly a chassis matter. U0131 belongs to the front steering, U0435 to invalid rear-steer data. Usually the rear wheels stay centred.
U0134 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0134
- Steering system warning lamp or message
- Larger turning circle, rear wheels no longer steer
Common causes of U0134
- Most likelyFuse, supply, ground or CAN wiring of the rear steering module faulty
- PossibleCorroded or wet connector at the rear axle actuator
- Less likelyRear steering control module internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rear power steering moduleCAN bus wiring
What each part of U0134 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 34 | The exact fault in that area. |
What to do next
- Note U0134 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0134
What does U0134 mean?
U0134 means "Lost Communication With Power Steering Control Module - Rear". U0134 is stored when a controller loses contact with the rear power steering control module, the actuator unit of a rear-wheel or four-wheel steering system. It is a generic code, so it means the same on every make.
Is it safe to drive with U0134?
U0134 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0134 fail an emissions test?
U0134 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0134 to fix?
Difficulty: hard. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will U0134 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.