Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 2
P2035 indicates the exhaust gas temperature (EGT) sensor circuit on Bank 2, Sensor 2 is reading a voltage that is too low. This sensor monitors exhaust temperature to help the engine control module optimize combustion and emissions. A low voltage signal typically means a wiring fault, poor connection, or sensor failure.
What You Might Notice
- Check engine light illuminated
- Possible rough idle or stumbling
- Reduced fuel economy
- Potential increase in emissions
- No immediate driveability loss in most cases
Most Common Causes
- 1
Loose or corroded connector
Corroded terminals or loose connectors at the EGT sensor are the most common cause. Moisture and oxidation degrade electrical connections and reduce signal voltage.
- 2
Broken or damaged wiring
Damaged insulation or broken wires in the EGT sensor circuit can cause a direct short to ground, resulting in a low voltage reading.
- 3
EGT sensor failure
The sensor itself may have failed internally or developed a short, preventing proper voltage output to the engine control module.
- 4
Engine control module malfunction
Though rare, the ECM circuit responsible for reading the EGT sensor signal may have failed, though this is less likely than sensor or wiring issues.
How to Diagnose It
- 1
Check Loose or corroded connector — Corroded terminals or loose connectors at the EGT sensor are the most common cause. Moisture and oxidation degrade electrical connections and reduce signal voltage.
- 2
Check Broken or damaged wiring — Damaged insulation or broken wires in the EGT sensor circuit can cause a direct short to ground, resulting in a low voltage reading.
- 3
Check EGT sensor failure — The sensor itself may have failed internally or developed a short, preventing proper voltage output to the engine control module.
- 4
Check Engine control module malfunction — Though rare, the ECM circuit responsible for reading the EGT sensor signal may have failed, though this is less likely than sensor or wiring issues.
How to Fix It
- 1
Inspect and clean connector
Locate the EGT sensor connector on Bank 2, Sensor 2 and inspect for corrosion, loose pins, or moisture. Clean with electrical contact cleaner and ensure proper seating. Reconnect firmly.
- 2
Repair wiring harness
Inspect the EGT sensor wiring for breaks, cuts, or damaged insulation. Repair by splicing and soldering with appropriate heat shrink tubing or replace the entire harness if damage is extensive.
- 3
Replace EGT sensor
If wiring and connections are intact, the sensor itself has likely failed. Remove the sensor from the exhaust and install a new one, ensuring proper torque specification.
- 4
Test engine control module
If all other components test good, the ECM may be faulty. Have the ECM tested with a diagnostic scanner or consult a professional technician for advanced diagnostics.
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