P0122
High SeverityThrottle Position Sensor A Circuit Low
Fuel System
P0122 — Instant Answer
Throttle Position Sensor A Circuit Low
Severity: HIGH SEVERITY
Meaning: TPS voltage is below minimum threshold. The ECM cannot determine throttle position accurately.
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. Faulty TPS (35-45% of cases)
- 2. Wiring short to ground (10-25% of cases)
- 3. Bad TPS connector (10-25% of cases)
- 4. ECM driver fault (5-10% of cases)
Symptoms
- ⚠️Engine stuck at idle
- ⚠️No acceleration response
- ⚠️Limp mode
- ⚠️Check engine light
Related Symptoms
Common Causes
How to Diagnose P0122
- 1Check TPS connector and wiring
- 2Measure TPS signal voltage
- 3Check 5V reference wire
- 4Replace TPS
OEM Procedures for P0122
Throttle/Pedal Position Sensor/Switch A Circuit Low 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 P0122 Throttle Position Sensor A Circuit Low.
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OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
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 P0122.
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 >...
Related Symptoms
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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 above maximum expected. ECM sees the throttle as more open than it actually is.
Frequently Asked Questions
- Why wont my car accelerate with P0122?
- The ECM thinks the throttle is fully closed, so it limits engine power. A new TPS usually fixes this immediately.
- Can I drive in limp mode?
- You can drive slowly to get home or to a shop, but speed is limited. Do not drive far in limp mode.
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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: 2026-10-28