P0123
High SeverityThrottle Position Sensor A Circuit High
Fuel System
P0123 — Instant Answer
Throttle Position Sensor A Circuit High
Severity: HIGH SEVERITY
Meaning: TPS voltage is above maximum expected. ECM sees the throttle as more open than it actually is.
Safe to drive? NO if CEL is flashing. YES with caution if solid, but repair this week.
Estimated repair cost: $20 - $100
Most common causes:
- 1. Failed TPS (35-45% of cases)
- 2. Open ground wire (10-25% of cases)
- 3. Short to voltage in signal wire (10-25% of cases)
Symptoms
- ⚠️High idle
- ⚠️Surging
- ⚠️Hesitation
- ⚠️Reduced power mode
Common Causes
How to Diagnose P0123
- 1Measure TPS voltage — should be ~0.5V at closed throttle
- 2Check TPS connector and ground wire
- 3Inspect for shorts in wiring
- 4Replace TPS
OEM Procedures for P0123
Throttle/Pedal Position Sensor/Switch A Circuit High Input Found 9 OEM service manual procedures.
Remove/Install/Overhaul - Removal (Tracker)
Remove/Install/Overhaul - Removal (Tracker)
Remove/Install/Overhaul - Removal (Tracker)
Remove/Install/Overhaul - Removal (Tracker)
Remove/Install/Overhaul - Removal (Tracker)
Remove/Install/Overhaul - Removal (Tracker)
Replacement - Replace Throttle Position Sensor
Replacement - Replace Throttle Position Sensor
Showing 8 of 9 procedures
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0123 Throttle Position Sensor A Circuit High.
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OBD2 scanner
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Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0123.
OEM Manual Evidence
Browse →Electronic Throttle Control DTCS — 2013 Acura MDX 3.7L Eng VIN 2 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined...
Electronic Throttle Control DTCS — 2013 Acura MDX 3.7L Eng VIN YD2 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagine...
Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Exact Vehicle Hubs
Browse →Open the exact vehicle hub grounded by OEM manual evidence related to P0123.
Open the exact vehicle hub grounded by OEM manual evidence related to P0123.
Open the exact vehicle hub grounded by OEM manual evidence related to P0123.
Related Codes
General fault in the TPS circuit. The TPS tells the ECM how far the throttle is open.
The TPS reading does not match expected values based on MAP, RPM, and other inputs. Erratic readings indicate a worn TPS.
TPS voltage is below minimum threshold. The ECM cannot determine throttle position accurately.
Frequently Asked Questions
- What causes TPS high voltage?
- Usually a failed TPS or an open ground wire that pulls the signal high. Less commonly a short in the wiring.
- Does P0123 cause high idle?
- Yes — the ECM thinks the throttle is partly open and may raise idle speed or behave erratically.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29