P1122 — Throttle Position (TP) Sensor Circuit Intermittent Low Voltage

What Does P1122 Mean?

P1122 is a manufacturer-specific diagnostic trouble code: Throttle Position (TP) Sensor Circuit Intermittent Low Voltage. This code applies to FORD, OTHER, LINCOLN, MERCURY, SUBARU 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 P1122

⚠️ Check Engine Light (MIL) illuminated
⚠️ Throttle Position (TP) Sensor signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Reduced engine performance

Common Causes

🔍 Loose or intermittent connection at Throttle Position (TP) Sensor
🔍 Wire chafing causing intermittent contact
🔍 Throttle Position (TP) Sensor failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P1122 mean?

P1122 indicates: Throttle Position (TP) Sensor Circuit Intermittent Low Voltage. The vehicle's computer has detected that the Throttle Position (TP) Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1122?

Yes, P1122 is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P1122?

Repair costs for P1122 typically range from $30 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 reseat all Throttle Position (TP) Sensor connectors
🔧 Repair chafed or damaged wiring in Throttle Position (TP) Sensor circuit
🔧 Replace Throttle Position (TP) Sensor if failing intermittently

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.

P1122: Throttle Position (TP) Sensor Circuit Intermittent Low Voltage