U058B code meaning
Invalid Data Received From Transmission Fluid Pump Module B
What U058B means
Some transmissions carry a second electrically driven oil pump with its own electronics, labelled module B, alongside or instead of a first one. Its job is to hold clutch pressure and lubrication while the combustion engine is off, so the receiving transmission or hybrid controller depends on the speed, current and fault status the pump reports. U058B is logged when those reports arrive but fail plausibility, counter or checksum checks. No manufacturer documents U058B or a pump B publicly. For pump A, Jeep replaces the in-pan electric pump on Wrangler and Grand Cherokee 4xe when lost communication U0287 appears with the MIL and limp mode. Expect start-stop or electric driving to be inhibited until the fault clears; U028A is the lost-communication partner.
U058B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U058B
- Start-stop or electric drive mode unavailable
- Transmission warning message
- Delayed engagement after an engine restart
Common causes of U058B
- Most likelyIntegrated electronics of electric pump B faulty
- PossiblePump B connector or pass-through in the transmission case wet or loose
- Less likelyPump firmware and transmission controller software not compatible
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transmission fluid pump module b
What each part of U058B means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8B | The exact fault in that area. |
What to do next
- Note U058B 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 U058B
What does U058B mean?
U058B means "Invalid Data Received From Transmission Fluid Pump Module B". Some transmissions carry a second electrically driven oil pump with its own electronics, labelled module B, alongside or instead of a first one. It is a generic code, so it means the same on every make.
Is it safe to drive with U058B?
Drive gently and only to a workshop. With U058B the car can go into limp mode (reduced power) to protect itself.
Will U058B fail an emissions test?
U058B 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 U058B to fix?
Difficulty: hard. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will U058B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.