P1810: TFP Valve Position Switch Circuit/ Transmission 4-Wheel Drive Low Indicator Short Circuit To Battery

OTHER FORD LINCOLN MERCURY BUICK CADILLAC CHEVY GM

Severity

Medium

System

Manufacturer-Specific Powertrain

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P1810 Mean?

P1810 is a manufacturer-specific diagnostic trouble code: TFP Valve Position Switch Circuit/ Transmission 4-Wheel Drive Low Indicator Short Circuit To Battery. This code applies to OTHER, FORD, LINCOLN, MERCURY, BUICK vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1810

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic TFP Valve Position Switch readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in TFP Valve Position Switch circuit (damaged, chafed, or corroded)
🔍 Faulty TFP Valve Position Switch connector or terminal
🔍 Failed TFP Valve Position Switch
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P1810 mean?

P1810 indicates: TFP Valve Position Switch Circuit/ Transmission 4-Wheel Drive Low Indicator Short Circuit To Battery. The vehicle's computer has detected that the TFP Valve Position Switch is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1810?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1810 for extended periods may cause additional problems.

How much does it cost to fix P1810?

Repair costs for P1810 typically range from $80 to $300, 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 TFP Valve Position Switch wiring and connectors
🔧 Replace faulty TFP Valve Position Switch

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.