P2035 Code? Here’s How to Fix It – Quickly and Easily

Among diagnostic codes, P2035 is a generic SAE definition indicating an Exhaust Gas Temperature (EGT) Sensor Circuit Low on Bank 2 Sensor 2. It means the control module detected a voltage signal below the normal operating range.

Because this code points to a specific circuit condition, the exact diagnostic path requires testing the sensor, wiring, and connectors. The code alone does not prove the sensor itself has failed.

Key Takeaways

• Condition detected: The PCM identified a low voltage condition in the EGT sensor circuit for Bank 2 Sensor 2.
• Electrical checks required: Diagnosis involves inspecting the wiring harness, testing circuit continuity, and verifying the sensor.
• System impacts: A faulty EGT sensor can disrupt diesel particulate filter (DPF) regeneration and emissions monitoring.
• Component testing: The wiring, connectors, and EGT sensor must be evaluated to isolate the exact point of the low voltage fault.

P2035 Code Description and Implications

P2035 is a generic SAE definition for Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 2.

The powertrain control module monitors the EGT sensors to manage emissions systems, such as the diesel particulate filter (DPF) and selective catalytic reduction (SCR).

When the module detects a voltage signal significantly below the expected range on the Bank 2 Sensor 2 circuit, it stores P2035. This indicates a short to ground, an open ground circuit, or a failed sensor.

Common Causes of the P2035 Code

• Damaged or chafed wiring: The harness routing near the exhaust system is exposed to extreme heat, making it vulnerable to melting or chafing against the chassis.
• Corroded or loose connectors: Moisture and road salt can corrode the sensor connector, disrupting the signal path.
• Failed EGT sensor: The internal thermistor may fail, resulting in a permanently low resistance or shorted state.
• Short to ground: The signal wire may be pinched or rubbing against a metal exhaust component, causing a direct short to ground.

Symptoms Associated With P2035

Possible symptoms include:

• Illuminated Check Engine Light (MIL).
• Inability to perform DPF regeneration, potentially leading to a clogged filter and reduced power.
• Engine derate or limp mode on heavy-duty applications to protect the emissions system.
• No noticeable drivability issues on some lighter applications, other than the warning light.

Diagnosing the P2035 Trouble Code

Diagnosing an EGT circuit low code requires a digital multimeter, a scan tool, and the vehicle’s specific wiring diagrams. The first step is to verify the exact factory definition.

A professional diagnostic workflow includes:

1. Scan for related codes: Check for additional EGT, DPF, or SCR system codes.
2. Monitor live data: Use a scan tool to view the EGT Bank 2 Sensor 2 PID. A reading of ambient temperature when the engine is hot indicates a circuit fault.
3. Visual inspection: Inspect the wiring harness from the PCM to the sensor for heat damage, chafing, or corrosion.
4. Test the circuit: Use a digital multimeter to check the 5-volt reference, signal circuit, and sensor ground according to the manufacturer procedure.

Repairing the P2035 Issue

Repairs must follow confirmed diagnosis. Never replace the powertrain control module based solely on the presence of a P2035 code.

• Wiring repair: If the harness is melted or chafed, repair the wires using high-temperature solder and heat shrink tubing.
• Connector replacement: If the plug is corroded, replace the pigtail connector with a component meeting the correct vehicle specification.
• Sensor replacement: If the sensor fails resistance or voltage testing, replace the EGT sensor.
• Clear and retest: Clear the codes and verify the live data PID responds correctly as the exhaust system heats up.

Cost Considerations for P2035 Repairs

The cost to resolve a P2035 code depends heavily on the root cause, diagnostic time, and component accessibility.

Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.

Prevention Strategies for Future Occurrences

While internal sensor failures are not always predictable, you can protect the circuit from common environmental damage.

• Protect the wiring harness: Ensure the sensor wiring is securely routed away from hot exhaust manifolds, turbochargers, and sharp chassis edges.
• Inspect during service: When performing exhaust or DPF service, visually check the EGT sensor wiring for early signs of heat degradation.

Troubleshooting Tips and Best Practices

• Do not assume the sensor is dead: A circuit low code frequently points to a chafed wire shorting to the exhaust or chassis. Always verify circuit continuity and inspect the harness first.
• Verify Bank and Sensor location: Ensure you are testing Bank 2 Sensor 2. Bank 2 is the engine bank that does not contain cylinder number one, and Sensor 2 is typically located downstream of the turbocharger or DPF.
• Check for TSBs: Some manufacturers issue Technical Service Bulletins for updated wiring harness shields or revised sensor designs to address chronic heat damage.

More OBD-II Codes

Frequently Asked Questions

Can a wiring short cause a P2035 code?

Yes. The signal wire for the EGT sensor routes near extremely hot exhaust components. If the insulation melts and the bare wire touches the metal chassis or exhaust, it creates a short to ground, triggering the circuit low code.

Is it safe to drive with a P2035 code?

You can typically drive to a repair facility, but you may experience reduced power. If the vehicle cannot monitor exhaust temperatures, it will disable DPF regeneration, which can eventually lead to a clogged filter and severe engine derate.

Will replacing the EGT sensor fix a P2035 code?

It will fix the issue if the internal thermistor has failed short. However, if the root cause is a melted wire or corroded connector, replacing the sensor will not resolve the circuit low fault. Proper diagnosis is required.

Does P2035 mean my PCM needs to be replaced?

No. P2035 indicates a low voltage condition in a specific sensor circuit. The root cause is usually heat-damaged wiring, a corroded connector, or a failed sensor. The PCM should only be considered after verifying circuit integrity.

Where is Bank 2 Sensor 2 located?

Bank 2 is the side of the engine that does not contain cylinder number one. Sensor 2 is typically the second EGT sensor on that bank, often located downstream of the turbocharger, catalytic converter, or diesel particulate filter.

What Should You Do About the P2035 Code?

Because the P2035 code indicates a low voltage fault in the Bank 2 Sensor 2 exhaust gas temperature circuit, it requires verifying the wiring and sensor before replacing components. Confirm the exact factory definition for your vehicle.

Inspect the wiring harness for heat damage, check the connectors, and test the relevant system and components. Follow the manufacturer’s diagnostic procedure to isolate the faulty component, repair the confirmed root cause, and verify the repair.