Cause
Interrupted module programming
A software or calibration write to a control module that did not finish — the supply voltage sagged, a connection was disturbed, the tool timed out, or the ignition was switched during the write.
The result is a module holding a partial image, which is worse than holding none: it may start, communicate and behave normally in most respects while some region of its data is missing or corrupt. The faults that follow tend to look like several unrelated component problems, because the damaged region governs whatever it happened to govern, and none of the named parts is faulty.
The cause is nearly always supply voltage, and it is preventable. Programming can take many minutes with the ignition on, no engine running, and the module transmitting continuously — a load a battery drains under steadily. A battery support unit is required for this work rather than recommended, and a jump pack or another running vehicle is not equivalent, because both deliver a voltage that fluctuates.
Recovery is usually reprogramming rather than replacement, and that is the point worth knowing: a module that has been mis-flashed frequently gets condemned and replaced when rewriting it correctly, on a stable supply, would have restored it. Ask for a reflash to be attempted before a new module is ordered — and expect that adaptations and calibrations will need re-entering afterwards either way.
Typically specialist work. Needs equipment or training most home workshops do not have.
Some of these codes mean you should stop driving
1 of the 64 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (64)
Codes where this is a likely explanation first, rather than merely a possible one.
- U0301 Software Incompatibility With Engine Control Module Likely for this code High
- U0305 Software Incompatibility With Cruise Control Module Likely for this code Moderate
- U0311 Software Incompatibility With Drive Motor Control Module Likely for this code High
- U0326 Software Incompatibility With Vehicle Immobiliser Control Module Likely for this code Stop driving High
- U0441 Invalid Data Received From Emissions Critical Control Information Likely for this code High
- U0464 Invalid Data Received From Navigation Control Module Likely for this code Moderate
- U3033 Control Module Security Certificate Missing/Invalid Likely for this code Moderate
- P0E5E Battery Charger Control Module A Processor Performance High
- P2673 Injection Pump Timing Calibration Not Learned Moderate
- P2674 Injection Pump Fuel Calibration Not Learned Moderate
- P2690 Cylinder 5 Injector Data Incompatible Moderate
- P2691 Cylinder 6 Injector Data Incompatible Moderate
- P2692 Cylinder 7 Injector Data Incompatible Moderate
- P2693 Cylinder 8 Injector Data Incompatible Moderate
- P27A7 Pressure Control Solenoid A Data Incompatible Moderate
- P27A8 Pressure Control Solenoid B Data Incompatible Moderate
- P27A9 Pressure Control Solenoid C Data Incompatible Moderate
- P27AA Pressure Control Solenoid D Data Incompatible Moderate
- P27AB Pressure Control Solenoid E Data Incompatible Moderate
- P27AC Pressure Control Solenoid F Data Incompatible Moderate
- P27AD Pressure Control Solenoid G Data Incompatible Moderate
- P27AE Pressure Control Solenoid H Data Incompatible Moderate
- P27AF Pressure Control Solenoid J Data Incompatible Moderate
- P27B0 Pressure Control Solenoid K Data Incompatible Moderate
- P280A Transmission Range Sensor A Circuit Not Learned Moderate
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
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