Is it safe to drive with a P0117 code?

Severity is medium. Address P0117 sooner rather than later — driving with an active check engine light can worsen the problem or void emissions warranties.

How much does it cost to fix P0117?

Repair costs for P0117 typically range from $15 to $150 in the US, depending on the underlying cause. The most common fix is: Damaged ECT sensor wiring (shorted).

What are the symptoms of P0117?

Check engine light. Cold-start issues even when warm. Rich running / black smoke. Cooling fans running constantly. Bad fuel economy.

Check Engine Code

P0117

Engine Coolant Temperature Sensor Circuit Low Input

Severity: medium DIY difficulty: 1/5 Typical cost: $15–$150

What P0117 means

The ECT signal is at or near 5V, which the ECM interprets as extremely cold engine. Usually a wiring fault or a failed sensor.

Symptoms

Check engine light
Cold-start issues even when warm
Rich running / black smoke
Cooling fans running constantly
Bad fuel economy

Likely causes (most common first)

Damaged ECT sensor wiring (shorted)
Failed ECT sensor
Corroded connector

Can I keep driving?

Medium — drivable but fix soon

Typical repair cost

DIY fixes can start near $15 (parts only). Shop repairs for P0117 typically run up to $150 depending on the underlying cause and vehicle. Start with the most common cause — Damaged ECT sensor wiring (shorted) — before throwing parts at it.

Related codes

P0118 P0125 P0128

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