P1543: Throttle Actuation Potentiometer Signal Too Low

VOLKSWAGEN BUICK CADILLAC CHEVY CHRYSLER GM GMC OLDSMOBILE

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 P1543 Mean?

P1543 is a manufacturer-specific diagnostic trouble code: Throttle Actuation Potentiometer Signal Too Low. This code applies to VOLKSWAGEN, BUICK, CADILLAC, CHEVY, CHRYSLER 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 P1543

⚠️ Check Engine Light (MIL) illuminated
⚠️ Abnormal signal from Throttle Actuation Potentiometer
⚠️ Related system may operate erratically
⚠️ Reduced engine performance

Common Causes

🔍 Throttle Actuation Potentiometer producing abnormal signal
🔍 Electromagnetic interference affecting Throttle Actuation Potentiometer signal
🔍 Wiring issue distorting Throttle Actuation Potentiometer signal

Frequently Asked Questions

What does P1543 mean?

P1543 indicates: Throttle Actuation Potentiometer Signal Too Low. The vehicle's computer has detected that the Throttle Actuation Potentiometer is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1543?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1543 for extended periods may cause additional problems.

How much does it cost to fix P1543?

Repair costs for P1543 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 Throttle Actuation Potentiometer and related wiring
🔧 Replace faulty Throttle Actuation Potentiometer

1
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2
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.