P0A35 — Drive Motor "B" Over Temperature

What are the symptoms of P0A35?

Drivers most often notice: the affected system operates intermittently or not at all, increased fuel consumption in some cases, Check Engine Light on, possible limp mode depending on the affected component.

Is it safe to drive with P0A35?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Will P0A35 clear itself?

Sometimes P0A35 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How much does it cost to fix P0A35?

Repair wiring or connectors — $80–$250; Control module repair — $300–$1,000; Replace the faulty sensor or actuator — $150–$500. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does OBD2 code P0A35 mean?

OBD2 code P0A35 flags a problem with the sensor and actuator circuits (drive motor "B" over temperature). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, blown fuse feeding the circuit, poor ground connection.

P0A35 is an OBD2 trouble code that points to an over-temperature condition in drive motor "B." The engine control module (ECM) monitors temperature sensors and related circuits throughout the hybrid or electric drive system, and it logs P0A35 when it detects readings that suggest the motor or its supporting electronics are running hotter than they should. This is not a one-time glitch code — the ECM requires the fault condition to appear repeatedly under specific operating conditions before it triggers the check engine light.

Drive motor "B" is typically the secondary electric motor found in hybrid vehicles or the traction motor in some plug-in hybrids. These units generate considerable heat during acceleration, braking regeneration, and high-load situations. The ECU relies on temperature sensors embedded in or near the motor to keep everything within safe thermal limits. When those sensors, their wiring, or the control circuits feeding them develop a fault, the module cannot read the temperature accurately. It responds by setting P0A35 and often reducing power or switching to a protective mode. The freeze frame data stored alongside P0A35 records engine load, RPM, vehicle speed, and coolant temperature at the moment the fault triggered — information that becomes essential when you reproduce those conditions during diagnosis.

Understanding why P0A35 sets requires thinking about the chain of components involved. A temperature sensor feeds a signal to the ECM through a specific circuit. That circuit needs proper reference voltage, a solid ground, and undamaged wiring to function reliably. Any break in that chain — corrosion at a connector, a chafed wire, a blown fuse, or a failing sensor — can produce false high-temperature readings or cause the signal to drop out entirely. The ECM interprets these anomalies as an over-temperature condition and protects the motor by logging the code.

Symptoms of P0A35

When P0A35 is active, you may notice one or more of the following:

• Drive motor "B" operates inconsistently or fails to engage at all during electric-only driving
• Noticeable increase in fuel consumption, especially in hybrid vehicles
• Check Engine Light remains illuminated on the dashboard
• Vehicle enters limp mode, restricting power output and top speed
• Hybrid system warning light may accompany the CEL
• Reduced or absent regenerative braking capability
• In severe cases, the engine may stall or fail to start

Common Causes

The root cause of P0A35 usually falls into one of these categories:

• Corrosion, looseness, or physical damage at the drive motor temperature sensor connector or related junctions
• Faulty drive motor temperature sensor or associated actuator within the circuit
• Open or shorted wiring in the sensor/actuator circuit feeding the ECM
• Poor ground connection at the motor assembly or control module
• Blown fuse supplying power to the affected circuit
• Internal failure within the control module driver responsible for the motor circuit

How to Diagnose P0A35

Follow these practical steps to pinpoint the cause of P0A35:

1. Connect an OBD2 scanner, confirm P0A35 is stored, and save the freeze frame data immediately. This snapshot tells you engine load, RPM, speed, and temperatures at the exact moment the fault occurred.
2. Check for any related diagnostic trouble codes. Codes appearing alongside P0A35 often point to the primary failure. Also search for technical service bulletins (TSB) specific to your make, model, and model year — manufacturers publish fixes and software updates for known P0xxx patterns.
3. Perform a thorough visual inspection of the wiring harness and connectors tied to drive motor "B." Look for damaged insulation, corroded pins, bent terminals, and any signs of moisture intrusion.
4. Use a multimeter to check reference voltage, ground integrity, and signal continuity at the sensor connector. Compare your readings to the specifications in your service manual.
5. Conduct a wiggle test on the harness while monitoring live data on your scanner. Any dropouts or wild fluctuations in the temperature signal point to broken wires or loose connections.
6. Clear the code, then drive the vehicle through a complete drive cycle that reproduces the freeze frame conditions. If P0A35 returns, the fault is confirmed and you can move forward with targeted repairs.

Repair Options and Costs

Once you have identified the failing component, here is what each repair typically involves:

• Wiring harness repair or connector replacement: $80–$250
• Control module diagnosis and repair: $300–$1,000
• Drive motor temperature sensor or actuator replacement: $150–$500

All price ranges reflect parts and labor at independent shop rates in USD.

Total Cost Summary

Your actual repair bill for P0A35 depends entirely on which part is at fault. The cheapest fix is usually a wiring repair or connector replacement, while the most expensive scenario involves the control module itself. In most cases, the total cost falls somewhere between $80 and $1,000. Always confirm the exact failure before purchasing expensive components — swapping the most expensive part first is rarely the right approach.

Can You Drive With P0A35?

Most vehicles remain drivable when P0A35 is active, though you may experience reduced performance, disabled electric-only mode, or limited hybrid functionality. Treat the situation as urgent if you notice stalling, failure to start, or warnings related to brakes or steering — in those cases, have the vehicle towed rather than risk being stranded. Otherwise, schedule diagnostics and repair promptly to prevent potential motor damage from a genuine overheating event.