P2470 code meaning
Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)
Powertrain system Generic code P24xx codes Check engine light
What P2470 means
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.
P2470 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2470
- MIL on
- Implausible value for the last exhaust probe
- Regeneration or DEF dosing inhibited
Common causes of P2470
- Most likelySignal wire chafed through and touching ground
- PossibleInternal short inside the probe
- Less likelyLow battery voltage during diagnosis distorting readings (Ram)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Egt sensor b1s4Egt wiring
What each part of P2470 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 70 | The exact fault in that area. |
What to do next
- Note P2470 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2470
What does P2470 mean?
P2470 means "Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2470?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2470 fail an emissions test?
Yes, it can. P2470 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2470 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2470 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.