P2470Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2470 means the signal of bank 1 probe number 4 has dropped below its valid floor, which on resistive probes indicates a short to ground. Ford's diesels flag a voltage under 0.10 V with the key on and 9 to 16.25 V supply, checked continuously over about 2 s. GM's diesel tables check whether the probe output stage is grounded: below 158 Ω in the 2017 and 2020 tables, below 500 Ω in 2018, and in the 2025 tables below 1 Ω or a digital reading under −72.8 °C after 19 of 25 samples, each time as a Type B fault. Ram lists P2470 for 2025–2026 Ram 2500/3500 in case S2625000003, which asks to check battery voltage before any exhaust sensor diagnosis. Chafed wiring at the exhaust and a shorted probe are the usual finds. Too high or open is P2471.
- What you may notice
- MIL on
- Implausible value for the last exhaust probe
- Regeneration or DEF dosing inhibited
- Likely causes
- LikelySignal wire chafed through and touching ground
- PossibleInternal short inside the probe
- RareLow battery voltage during diagnosis distorting readings (Ram)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.