Roewe Plug-in Hybrid Powertrain Drive Control Module (TC) Fault Diagnosis Guide

Fault Background

The powertrain drive control module (TC) of the Roewe plug-in hybrid (manual 846) is integrated inside the Power Electronics Box (PEB) and is responsible for inverter drive (INV), torque control, and anti-theft key verification. The code thresholds are highly quantified: resolver differential signal amplitude <2.09V / >4.14V, resolver tracking error >9 degrees, input speed following rate >10000RPM, failure to reach 1500rpm within a given time, three-phase current amplitude difference >40A, IGBT three-phase temperature >145°C / <-55°C, PEB water temperature >82°C, internal power supply >5.25V, DFW frequency outside 135~146Hz; in terms of safety mechanisms, fault levels carry "limp home (fault level 2) + SVS fault warning light", and history codes are still cleared after 40 wake/standby cycles. This article is organized into a diagnostic guide following "resolver speed → three-phase current → IGBT temperature → cooling → internal power → anti-theft key → CAN".

Resolver and Speed Family

Diagnostic path: Clear codes and retest → Check PEB and motor resolver wiring harness connectors (loose/poor contact/twisted/corroded/contaminated/deformed) → Inspect/replace power electronics box; if P1C50/P1C52 recur, refer to the drive motor manual for further inspection.

Three-Phase Current Family

U/V/W phases each have two codes: P1C63/64 (U phase current greater/less than threshold), P1C66/67 (V phase), P1C69/6A (W phase); P1D19/P1D1C/P1D1D: each phase current amplitude differs from the other two phases by >40A; P0A61: V phase current AD offset not within threshold range at power-up; P1DC2: phase current higher than limit standard 1 and standard 2. Handling: Clear codes and retest → Check three-phase wiring harness and PEB connectors → Inspect/replace power electronics box; if the 40A phase-to-phase difference recurs, check the motor windings per the drive motor manual.

IGBT Temperature Family (Independent thresholds per phase)

• P1C80/P1C81 IGBT U-phase temperature >145°C / <-55°C; P1C82/P1C83 V-phase; P1C84/P1C85 W-phase—limp home, fault level 2;
• P1D11/P1D12/P1D13 Power module U/V/W phase DBC temperature vs. three-phase average temperature: absolute difference exceeds threshold—single phase deviating from average points to that phase's NTC or uneven heat dissipation.

Handling: Read "IGBT temperature" live data for plausibility → Check cooling pump status feedback (same family as P1C49/P1651) → Check coolant level/contamination → Check PEB connectors → Inspect/replace power electronics box.

Cooling System Family

• P1CC1~P1CC8 EDS cooling water pump controller family: Feedback signal below standard (P1CC2) / above standard (P1CC3) / TC still receives controller signal when pump power is off (P1CC4) / feedback signal minimum time exceeded (P1CC5~8)—Check EDS cooling water pump connector BY240, vehicle control unit BY260, engine compartment fuse box BY016, EDS cooling water pump fuse F39, coolant level and contamination; replace pump if damaged;
• P1D7A Water temperature exceeded: PEB water temperature >82°C—Check PEB water temperature sensor connector BY210 (terminals BY260-73 ↔ BY210-1, etc.);
• P1DE1~P1DEF Torque limiting family: Torque after rotor over-temperature limit less than threshold, torque after coolant temperature limit less than threshold × external characteristic, etc.—Code set when temperature limiting strategy is active; first check corresponding temperature signals and cooling system;
• P1C73/P1C75/P1C76/P1D78 TM stator temperature family: Limp home level 2; read "TM stator temperature" for plausible values.

Power Supply and Internal Family

• P1C2C VDD30 power supply overvoltage (2.2 platform, supplies INV drive);
• P1C2E/P1C2F DFW frequency outside operating range (135Hz~146Hz);
• P1D2E Internal voltage >5.25V; P1D24/P1D25 Internal power supply VDD563 overvoltage (INV2.3 platform internal power);
• P1D22/P1D23 GPTA clock frequency outside operating range (judged by hardware pin status);
• P1D28/P1D29 Torque calculation dual-path verification: difference between torque calculated by two independent paths exceeds a certain value (safety monitoring mechanism);
• P1C8C Sensor AD value greater than threshold / P1C8D Bus terminal voltage exceeds threshold / P1DCD DC converter output voltage fluctuation exceeds levels 1 and 2.

Anti-theft Key and CAN Family

Anti-theft key (P1611/P1612/P1614): P1611 PEB has not learned the key; P1612 received wrong response frame (format correct); P1614 key verification failed—Perform key learning procedure per the "Anti-theft" chapter, then clear codes and retest.

CAN family: U0073/U0074 CAN bus off / unable to receive power electronics box module messages within specified time (87:); U0293 vehicle control unit module message timeout; U168A (HCU_HSC2_FrP05) 82: counter mismatch / 83: checksum mismatch more than 2 times / 87: timeout; U168E (FrP02), U1994 (FrP01 frame counter) same pattern; U1763 CAN frame GW_HSC1_SDM FrP00 timeout (accompanied by P1C7F CAN Crash signal set—collision-related, refer to airbag system). Handling: Check CAN wiring harness connectors → Clear if data frames received continuously for 100 times → Inspect/replace corresponding control module.

Safety Warnings

• This article is for technical reference. PEB/TC are high-voltage and power components; maintenance must be performed by qualified technicians (electrician certificate + company training authorization) per OEM specifications.
• Before high-voltage testing: ignition OFF, wait at least 5 minutes, operate the manual service disconnect switch to disconnect high-voltage battery power, and disconnect the 12V battery negative terminal.
• Anti-theft key learning must follow the OEM anti-theft procedure; a PEB that has not learned the key cannot power up; do not replace learning with code clearing.
• For cover-open maintenance, seek professional technical support; after replacing the control module, complete programming and setup per the module self-learning and programming manual.

Maintenance Insights

The most noteworthy aspect of the Roewe TC code table is the "three-phase symmetry threshold" concept: IGBT temperature is not reported as a single code, but as U/V/W each phase has two codes (>145°C over-temperature / <-55°C open circuit), plus P1D11~13 "single-phase DBC temperature vs. three-phase average deviation"—single-phase high points to that phase's NTC or uneven heat dissipation, while all three phases high points to the cooling system, allowing you to narrow down the issue without disassembling the box. The resolver family uses a "amplitude window + tracking error" dual threshold (normal between 2.09V~4.14V, tracking error ≤9 degrees), combined with P1C50 "estimated speed vs. resolver speed" plausibility check, clearly distinguishing three types of problems: resolver signal attenuation/disconnection/angle calibration error. Two common pitfalls: P1611 "PEB has not learned the key" is not a fault but a procedure—key learning is mandatory after PEB replacement; clearing codes won't help; P1CC4 "controller signal still received when pump power is off"—this is a typical sign of reverse leakage/feedback anomaly in the pump controller; first check fuse F39 and the pump itself. Finally, remember the level discipline: limp home level 2 + SVS light codes (IGBT temperature, stator temperature) allow the vehicle to be driven at reduced power to a repair point, but level 3 codes immediately cut high voltage.

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【This article is for reference only】