U3017 code meaning
Control Module Timer/Clock Performance
Network system Generic code U30xx codes Check engine light
What U3017 means
U3017 means a module distrusts its own time base: the clock or timer it counts with disagrees with what it expects, often time received from another unit over the network. In practice it is mostly a software matter. Ram's 6.7 L Cummins trucks list U3017 in a long series of ECM reflash bulletins from 2014 on (e.g. 18-002-14, 18-019-20) to stop the MIL when nothing is defective, and Ram's 2019 eTorque battery module got new software for it (08-030-24). Nissan's NTB17-066 reprograms the Titan XD 5.0 L diesel ECM for a lit MIL with U3017. Volvo and Mack trucks of 2016–2017 set it intermittently, about 18 min after start; the advice is not to swap the ECU or cluster but to update software or wait 5 s with key on before cranking. Audi traces U301700 in the A3's 48 V battery module to a flat 12 V battery after long standstill.
U3017 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.2 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U3017
- MIL on without any drivability complaint
- Code appears some minutes after start and later goes inactive
- Reappears after clearing until the module software is updated
Common causes of U3017
- Most likelyModule software that flags timing differences too readily; fixed by reprogramming
- PossibleTime or key-off information from another module arriving late or implausible at start-up
- PossibleDischarged 12 V battery after a long standstill
- Less likelyReal defect of the module's clock circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Control moduleModule oscillator
What each part of U3017 means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 17 | The exact fault in that area. |
What to do next
- Note U3017 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 U3017
What does U3017 mean?
U3017 means "Control Module Timer/Clock Performance". U3017 means a module distrusts its own time base: the clock or timer it counts with disagrees with what it expects, often time received from another unit over the network. It is a generic code, so it means the same on every make.
Is it safe to drive with U3017?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U3017 fail an emissions test?
Yes, it can. U3017 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U3017 to fix?
Difficulty: medium. A typical repair takes 0.2 to 1.5 hours of work. This is a job for a workshop.
Will U3017 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.