P2470: 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. 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.

Medium severity. Can I keep driving?If the light is on steadily, take a highway drive or go to a repair shop soon. If the car is in limp mode or the light is flashing, do not push the engine.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

MIL on
Implausible value for the last exhaust probe
Regeneration or DEF dosing inhibited

Most likely causes

Signal wire chafed through and touching ground
Internal short inside the probe
Low battery voltage during diagnosis distorting readings (Ram)

What to check, in order

Start with the simplest. You can tick off each step.

Read the soot load and differential pressure with a scanner
With the connector unplugged, check whether the signal wire is making contact with ground.
Check the differential pressure sensor's hoses
Check the temperatures before and after the filter
Fix any fuel injection or EGR codes before regenerating
Perform a regeneration while driving or at a repair shop when the diagnosis allows it

Good to know

Repair difficulty: medium
It affects emissions.

What each character of P2470 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
4: Emissions
70: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2470?

If the light is on steadily, take a highway drive or go to a repair shop soon. If the car is in limp mode or the light is flashing, do not push the engine.

What causes code P2470?

The most common causes are: signal wire chafed through and touching ground; internal short inside the probe; low battery voltage during diagnosis distorting readings (Ram).

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.