P071F — Transmission Mode Switch B Circuit High

What Does P071F Mean?

P071F is a diagnostic trouble code indicating: Transmission Mode Switch B Circuit High. This code relates to the transmission system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P071F

⚠️ Check Engine Light (MIL) illuminated
⚠️ Transmission Mode Switch B reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Harsh or delayed shifting

Common Causes

🔍 Short to voltage in Transmission Mode Switch B wiring harness
🔍 Corroded or water-damaged Transmission Mode Switch B connector
🔍 Faulty Transmission Mode Switch B outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P071F mean?

P071F indicates: Transmission Mode Switch B Circuit High. The vehicle's computer has detected that the Transmission Mode Switch B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P071F?

Only short distances if absolutely necessary. P071F affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P071F?

Repair costs for P071F typically range from $20 to $500, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Transmission Mode Switch B wiring for short to voltage
🔧 Clean or replace corroded Transmission Mode Switch B connector
🔧 Replace faulty Transmission Mode Switch B

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P071F: Transmission Mode Switch B Circuit High