P2470
Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 4
Exhaust temperature / emissions
Generic OBD-II
Medium
What it means
P2470 means the ECM detected low voltage (a short-to-ground or open) in the exhaust gas temperature (EGT) sensor circuit for bank 1, sensor 4. This sensor reports exhaust temperature so the ECM can protect the turbo, catalyst, and diesel particulate filter. A low-circuit fault gives an unreliable reading, which can limit performance or regeneration while the engine keeps running.
Medium
Can I keep driving? Usually drivable, but the ECM may limit power or diesel-filter regeneration to protect the exhaust — have it checked soon.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power or limp mode in some vehicles
- On diesels, disabled or incomplete particulate-filter (DPF) regeneration
- Emissions-related warnings
Common causes
Most likely first
- Short-to-ground or open in the EGT sensor circuitLikely
- Faulty exhaust gas temperature (EGT) sensorCommon
- Corroded or loose connector at the sensorCommon
- Heat- or chafe-damaged wiring near the exhaustLess often
- Rarely, an ECM faultLess often
How to diagnose & fix
Work through it in order
- Scan for codes and record freeze-frame data.
- Inspect the EGT sensor connector and wiring for a short-to-ground or open.
- Measure the sensor signal voltage and compare against specification.
- Check continuity of the signal and ground wires back to the ECM.
- Replace the EGT sensor if it is out of spec, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2470?+
Usually yes short-term, but the ECM may cut power or skip diesel-filter regeneration, so repair it before soot builds up.
Can I just clear P2470?+
It will return until the low-circuit fault or sensor is repaired.
Related codes
Often seen with P2470
Read & clear P2470 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX