Dongfeng Renault K-ZE Motor Controller DTC Quick Reference Guide
Fault Background
The Dongfeng Renault K-ZE (1692 manual) motor controller (self-developed motor) DTC table is a "code-cause-recommendation" three-column quick reference, covering five families: pedal, vacuum brake, P gear, power supply, and CAN communication. The repair recommendations are highly direct: B11501/11502 accelerator pedal angle signal voltage high/low → replace accelerator pedal assembly; P2304 vacuum sensor failure (short to ground/short to power/open circuit/signal out of valid range) → replace vacuum sensor; P2310 vacuum pump slow pressure drop leak → replace vacuum pump assembly; P gear three codes → check if P gear engage/disengage can self-recover, otherwise replace P gear controller assembly. Communication family (U0294 BMS/U0292 MCU/U0155 instrument/U0116 AC/U0121 ABS/U0140 BCM/U0131 EPS) uniformly "check wiring harness and corresponding controller". This article organizes the code table and diagnostic discipline into a quick reference guide.
Pedal and Power-On Self-Test Family
| Code | Meaning | Repair Recommendation |
|---|---|---|
| B11501 | Accelerator pedal angle signal voltage high | Replace accelerator pedal assembly |
| B11502 | Accelerator pedal angle signal voltage low | Replace accelerator pedal assembly |
| B11507 | Vehicle power-on self-test failed | Motor or battery fault → Check powertrain system |
| — | Ignition key position signal abnormal | Key switch sensor abnormal → Replace key lock |
| — | Pre-charge related | Check service disconnect switch or pre-charge circuit |
Vacuum Brake Family
| Code | Meaning | Possible Causes | Repair Recommendation |
|---|---|---|---|
| P2304 | Vacuum sensor failure | Sensor short to ground; sensor short to power; sensor open circuit; sensor signal out of valid range | Replace vacuum sensor |
| P2310 | Vacuum pump slow pressure drop leak | Slow leak between electric vacuum pump and check valve; slow leak in the air intake pipe from booster (including check valve) to vacuum tank end | Replace vacuum pump assembly |
| — | Master cylinder pressure sensor signal abnormal | Sensor fault or wiring fault | Replace master cylinder pressure sensor (check wiring first) |
| — | Brake light switch sensor fault | Brake light switch sensor fault or wiring fault | Replace brake light switch sensor or check wiring |
P Gear Controller Family
Three codes share the same diagnostic logic: P gear controller self-reported fault / P gear controller actuator motor fault / P gear controller unlock fault—first check if P gear engage/disengage can self-recover: if it can self-recover, just clear the DTC; otherwise replace the P gear controller assembly.
Power Supply and Communication Family
- P0561 Battery voltage error: Battery failure or low charge → Check/replace battery;
- P2314 PCAN bus fault: CAN wiring harness or connector terminal short to battery positive or body ground → Check wiring harness or connector, eliminate short;
- Seven communication loss codes (unified handling): U0294 BMS communication loss / U0292 MCU communication loss / U0155 instrument communication loss / U0116 AC controller communication loss / U0121 ABS communication loss / U0140 BCM communication loss / U0131 EPS communication loss—first check wiring harness, then check corresponding controller.
Discipline: The repair recommendations in this table follow "wiring first, then controller"—for communication codes, always check wiring and connectors first; for actuator types (pedal/sensor/pump), direct replacement is recommended because these parts are not internally serviceable.
Diagnostic Discipline
- Use a dedicated diagnostic scan tool for fault diagnosis; refer to the scan tool's diagnostic prompts for specific information;
- For communication codes, first perform CAN wiring short circuit check (to battery positive/to body ground);
- After replacing pedal assembly, re-run power-on self-test (B11507 will block unresolved powertrain faults);
- For P gear codes, try self-recovery first (engage/disengage cycle) to avoid blindly replacing the P gear controller assembly;
- For vacuum codes, first distinguish sensor failure (P2304) from mechanical slow leak (P2310)—one is electronic, the other is seal/pipe; replacing the wrong part treats symptoms, not root cause.
Safety Warning
- This article is for technical reference only. Repairs involving high voltage (powertrain self-test/service disconnect switch/pre-charge circuit) and brake vacuum system must be performed by qualified professional technicians (electrician certification + enterprise training).
- Before checking pre-charge/service disconnect switch, disconnect high-voltage power; after replacing vacuum system and brake-related components, perform brake performance verification and vacuum build-up time test.
- When troubleshooting communication codes, pay attention to measurement safety for CAN wiring shorts to power/ground; after replacing controllers, follow scan tool procedures to complete configuration.
Repair Insights
The most valuable part of this quick reference table is not the codes themselves, but the three sets of "triage" logic: Vacuum family distinguishes "electronic" from "mechanical"—P2304 is sensor (four failure modes listed: short to ground/short to power/open/out of range), P2310 is mechanical slow leak (leak points precisely identified as "between electric vacuum pump and check valve" and "air intake pipe from booster to vacuum tank end"); if the code persists after replacing the vacuum pump, check the check valve and air intake pipe, don't keep focusing on the sensor; P gear family tries self-recovery first—all three codes may just be transient actuator sticking; if engage/disengage cycle self-heals, clear the code; only replace the P gear controller assembly if not; Communication seven codes: wiring first, then controller—U codes default to "wiring or controller", so first eliminate CAN short to power/ground, saving significant replacement costs. Pedal family (B11501/2) direct replacement is the correct strategy—the pedal has dual-channel sensors for rationality check, and a single channel signal anomaly cannot be repaired individually. Finally, don't forget B11507 "power-on self-test failed" is a master switch code—it blocks everything else; when it appears, check the powertrain system first, don't blindly follow pedal/communication paths.
【This article is for reference only】
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⚠️ High-voltage repairs require professional certification; this article is for technical reference only — always follow the OEM service manual.