P0791Transmission

Intermediate Shaft Speed Sensor Circuit

P0791 means the intermediate shaft speed sensor circuit is faulty. This sensor helps the transmission calculate gear ratios, so faults affect shifting.

🚗 Risky. Loss of intermediate shaft speed data can cause shift faults or limp mode. Address it soon.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty intermediate shaft speed sensor$80-$350

40%

The sensor fails to report shaft speed.

#2Wiring or connector fault$40-$300

30%

Damaged wiring or a corroded connector.

#3Low or contaminated fluid$80-$300

15%

Poor fluid can disturb sensor operation.

#4Internal transmission fault$200-$2000

15%

Internal wear can affect the signal.

🩺 Common Symptoms

Harsh or erratic shifting
Limp mode
Check engine light
Wrong shift points

💰 Repair Cost: DIY vs Shop

DIY Cost

$80-$350

Shop Cost

$150-$600

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P0791

1Check the fluid level and condition

2Inspect the sensor wiring and connector

3Test the intermediate shaft speed sensor

4Replace the sensor if faulty

❓ Frequently Asked Questions

Can I drive with P0791?

Risky. Shifting can be affected. Fix it soon.

How much to fix P0791?

A speed sensor is often $150-$600 installed.

Is P0791 serious?

Yes. It affects shift control.

🔗 Related Codes

P0792P0793P0715P0720