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Home / DTC / P2135 — Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle Position Sensor (TPS) failure, Wiring issue

P2135 — Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle Position Sensor (TPS) failure, Wiring issue

Detailed page for trouble code P2135.

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P2135

AUDI P — Powertrain

Accelerator Pedal Position (APP) assembly failure, Powertrain Control Module (PCM) failure, Throttle Position Sensor (TPS) failure, Wiring issue

Brand: AUDI
Type: P — Powertrain
Views: UK: 15 EN: 68 RU: 42
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty accelerator pedal position (APP) sensor/module
  • Faulty throttle position sensor (TPS) or electronic throttle body
  • Damaged wiring harness or connector (open, short to power/ground, high resistance, corrosion)
  • Poor or intermittent connector pin contact
  • Failed or intermittent PCM/engine control module
  • Water ingress or contamination at pedal or throttle connectors

Symptoms

  • MIL (Check Engine) illuminated
  • Reduced engine power / limp-home mode engaged
  • Poor throttle response, hesitation or surging
  • Engine may not respond to accelerator pedal or shows delayed response
  • Stored freeze-frame data showing pedal/throttle signal mismatch

What to check

  • Read all stored DTCs and freeze-frame data with a capable scan tool
  • Record live data: APP sensor channels and TPS channel while key on and while varying pedal/throttle
  • Verify ignition key state and throttle control inputs during code set (some systems require learning/reset after battery disconnect)
  • Visually inspect connectors and wiring for damage, corrosion, water, or loose pins at APP, throttle body and PCM
  • Wiggle test wiring harness while observing live sensor values for intermittent changes
  • Check for other related codes (CAN bus, power supply, ground faults)

Signal parameters

  • 5 V reference supply expected on sensor reference circuit (verify at connector)
  • Sensor outputs typically vary between ~0.5–4.5 V from closed to wide-open; both APP channels should change smoothly and proportionally
  • Secondary APP/TPS channel should track the primary channel within a small offset and show expected correlation (no sudden divergence)
  • At key on (engine off) some sensors will show a parked/closed voltage; compare to manufacturer spec

Diagnostic algorithm

  1. Connect a professional scan tool and record stored codes, freeze-frame, and live APP/TPS data. Note when the code set and under what conditions.
  2. Attempt to reproduce the fault while monitoring live data: press pedal slowly to full travel and observe both APP channels and TPS for smooth, correlated movement.
  3. Visually inspect APP and throttle body connectors and wiring for damage, corrosion, or water intrusion. Repair any visible damage.
  4. Back-probe the sensor connectors: with key ON (engine off) verify 5 V reference, signal voltages, and ground continuity. Compare voltages to expected range and check that both APP channels move proportionally.
  5. Perform a wiggle test on wiring and connectors while watching live data to locate intermittent short/open or high-resistance joints.
  6. If wiring and connectors check good, unplug sensors one at a time and observe behavior per factory procedure (some vehicles will log additional codes; follow OEM steps).
  7. Check continuity from sensor signal pins to the PCM and check for shorts to battery or ground. Repair any open/shorts found.
  8. If wiring and sensors test within spec, follow manufacturer procedure to test/replace throttle body or APP module. Replace the failed component only after verifying cause.
  9. After repair, clear codes, perform any required relearn/initialization procedure (throttle/A/T learn), and road-test to confirm the fault does not return.
  10. If fault persists after replacing sensors and repairing wiring, evaluate PCM operation or replace/flash only per factory guidance (consider PCM as last resort).

Likely causes

  • Damaged/loose connector or pin at APP or throttle body (most common)
  • Wiring harness chafing or short to ground/power
  • Failed APP sensor assembly
  • Failed throttle position sensor or throttle body motor assembly
  • Intermittent PCM input circuit fault (least common)

Fault status

⚠️ Status
PCM detected inconsistent or implausible correlation between accelerator pedal position and throttle position sensor signals; control strategy reduced engine power and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0120 P0121 P0122 P0123 P0220 P0221
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Years: 2008 Manual in English Pages: 187 4.9 MB
Short description

Workshop manual for the 6‑speed manual gearbox 0B1 (front‑wheel drive). Includes identification, technical data, gearbox/selector removal & installation procedures, clutch hydraulics, adjustment instructions and front differential service. Applicable to Audi A4, Audi A5 (Coupé, Cabriolet, Sportback) and Audi Q5 as referenced in the manual. Edition: 05.2014.

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Key sections:
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Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002

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Short description

Service manual for Audi A3 (1997) 1.6L 4‑cylinder (2‑valve) engines (codes AEH, AKL, APF). Includes technical data, engine removal/installation, crankshaft group, cylinder head and valve gear, lubrication, cooling and exhaust system procedures. Edition 07.2002.

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Contents
Key sections:
  • 00 - Technical data ............................................................1
  • 1 Technical data ............................................................1
  • 1.1 Technical data .......................................................1
  • 1.2 Engine number .......................................................1
  • 1.3 Engine data ........................................................1
  • 10 - Removing and installing engine ..........................................3
  • 1 Removing and installing engine .........................................3
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  • 1.2 Removing - vehicles with engine codes AEH, AKL .....................4
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Code

P2135

Generic P — Powertrain

Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

Brand: Generic
Type: P — Powertrain
Views: UK: 18 EN: 110 RU: 77
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty accelerator pedal position (APP) sensor/module
  • Faulty throttle position sensor (TPS) or electronic throttle body
  • Damaged wiring harness or connector (open, short to power/ground, high resistance, corrosion)
  • Poor or intermittent connector pin contact
  • Failed or intermittent PCM/engine control module
  • Water ingress or contamination at pedal or throttle connectors

Symptoms

  • MIL (Check Engine) illuminated
  • Reduced engine power / limp-home mode engaged
  • Poor throttle response, hesitation or surging
  • Engine may not respond to accelerator pedal or shows delayed response
  • Stored freeze-frame data showing pedal/throttle signal mismatch

What to check

  • Read all stored DTCs and freeze-frame data with a capable scan tool
  • Record live data: APP sensor channels and TPS channel while key on and while varying pedal/throttle
  • Verify ignition key state and throttle control inputs during code set (some systems require learning/reset after battery disconnect)
  • Visually inspect connectors and wiring for damage, corrosion, water, or loose pins at APP, throttle body and PCM
  • Wiggle test wiring harness while observing live sensor values for intermittent changes
  • Check for other related codes (CAN bus, power supply, ground faults)

Signal parameters

  • 5 V reference supply expected on sensor reference circuit (verify at connector)
  • Sensor outputs typically vary between ~0.5–4.5 V from closed to wide-open; both APP channels should change smoothly and proportionally
  • Secondary APP/TPS channel should track the primary channel within a small offset and show expected correlation (no sudden divergence)
  • At key on (engine off) some sensors will show a parked/closed voltage; compare to manufacturer spec

Diagnostic algorithm

  1. Connect a professional scan tool and record stored codes, freeze-frame, and live APP/TPS data. Note when the code set and under what conditions.
  2. Attempt to reproduce the fault while monitoring live data: press pedal slowly to full travel and observe both APP channels and TPS for smooth, correlated movement.
  3. Visually inspect APP and throttle body connectors and wiring for damage, corrosion, or water intrusion. Repair any visible damage.
  4. Back-probe the sensor connectors: with key ON (engine off) verify 5 V reference, signal voltages, and ground continuity. Compare voltages to expected range and check that both APP channels move proportionally.
  5. Perform a wiggle test on wiring and connectors while watching live data to locate intermittent short/open or high-resistance joints.
  6. If wiring and connectors check good, unplug sensors one at a time and observe behavior per factory procedure (some vehicles will log additional codes; follow OEM steps).
  7. Check continuity from sensor signal pins to the PCM and check for shorts to battery or ground. Repair any open/shorts found.
  8. If wiring and sensors test within spec, follow manufacturer procedure to test/replace throttle body or APP module. Replace the failed component only after verifying cause.
  9. After repair, clear codes, perform any required relearn/initialization procedure (throttle/A/T learn), and road-test to confirm the fault does not return.
  10. If fault persists after replacing sensors and repairing wiring, evaluate PCM operation or replace/flash only per factory guidance (consider PCM as last resort).

Likely causes

  • Damaged/loose connector or pin at APP or throttle body (most common)
  • Wiring harness chafing or short to ground/power
  • Failed APP sensor assembly
  • Failed throttle position sensor or throttle body motor assembly
  • Intermittent PCM input circuit fault (least common)

Fault status

⚠️ Status
PCM detected inconsistent or implausible correlation between accelerator pedal position and throttle position sensor signals; control strategy reduced engine power and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0120 P0121 P0122 P0123 P0220 P0221
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Years: 2008 Manual in English Pages: 187 4.9 MB
Short description

Workshop manual for the 6‑speed manual gearbox 0B1 (front‑wheel drive). Includes identification, technical data, gearbox/selector removal & installation procedures, clutch hydraulics, adjustment instructions and front differential service. Applicable to Audi A4, Audi A5 (Coupé, Cabriolet, Sportback) and Audi Q5 as referenced in the manual. Edition: 05.2014.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Identification
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Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002

Workshop Manual
Years: 1997 Manual in English Pages: 283 4.3 MB
Short description

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199,00 UAH
Contents
Key sections:
  • 00 - Technical data ............................................................1
  • 1 Technical data ............................................................1
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199,00 UAH
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Key sections:
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  • 1 Engine number
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  • 3 Safety precautions
  • 3.1 Working on the fuel system
  • 3.2 Procedure before opening high-pressure section
  • 3.3 Working on the cooling system
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Years: 2004 Manual in English Pages: 150 68.2 MB
Short description

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199,00 UAH
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Key sections:
  • List of Workshop Manual Repair Groups
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Workshop Manual
Years: 2001–2003 Manual in English Pages: 307 7.3 MB
Short description

Comprehensive workshop manual for Audi A4 (2001) and A4 Cabriolet (2003) with the 4.2 L V8, 5‑valve engine with timing chains (Engine IDs BBK/BHF). Includes step‑by‑step procedures for engine removal/installation, crankshaft and timing chain service, cylinder head/valve gear, lubrication, cooling and exhaust system repairs. Intended for professional technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Engine number
  • 2 Engine data (Codes: BBK / BHF; 4.163 l; 253 kW @7000 rpm; torque 410–420 Nm; bore 84.5 mm; stroke 92.8 mm; compression ratio 11.5; RON 98)
  • 3 Safety precautions
  • 4 General repair instructions (cleanliness, fuel system, contact corrosion)
  • 10 - Removing and installing engine
  • 1 Removing engine - vehicles with manual gearbox
  • 1.1 Removing engine (tools, drain fluids, remove bumper, lock carrier, disconnect wiring, fuel, coolant, A/C lines, suspension components, propshaft, exhaust, support engine on platform, lower assembly)
  • 1.2 Separating engine and gearbox (subframe removal, support sets, remove front exhaust pipes, bolt sequence)
  • 1.3 Securing engine to engine and gearbox stand (lifting tackle, VAS 6095 support)
  • 1.4 Installing engine (clutch remarks, alignment, torque values)
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Workshop Manual
Years: 2001 Manual in English Pages: 259 2.0 MB
Short description

Workshop Manual for Audi A4 and A4 Cabriolet — Auxiliary Heater (Edition 08.2004). Contains self-diagnosis procedures, fault tables, electrical and fuel system checks, final control tests, CO₂ exhaust adjustment and step-by-step removal/installation and repair procedures. Intended for professional workshop use.

199,00 UAH
Contents
Key sections:
  • 01 - Self-diagnosis, electrical checks
  • 1 Auxiliary heater self-diagnosis
  • 1.1 Technical data of self-diagnosis
  • 1.2 Function
  • 1.3 Fault recognition
  • 1.4 Guided fault-finding
  • 1.5 Technical data of self-diagnosis
  • 1.6 Test requirements for self-diagnosis
  • 1.7 Safety precautions
  • 2 Self-diagnosis procedure
  • 2.1 Connecting vehicle diagnostic VAS 5051A/K-wire adapter
  • 2.1.1 Control unit identification
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Workshop Manual
Years: 2001 Manual in English Pages: 34 851.0 KB
Short description

Service manual for Audi A4 (2001‑) and A4 Cabriolet (2003‑) with 1.8L 4‑cylinder turbo engines. Covers Motronic fuel injection and ignition systems, diagnostic and maintenance procedures. Includes technical data, removal/installation steps and system checks.

199,00 UAH
Contents
Key sections:
  • 24 - Mixture preparation - injection
  • 1 Safety precautions and rules for cleanliness
  • 1.1 General notes on self-diagnosis
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Rules for cleanliness and instructions for working on fuel system
  • 1.4 Checking vacuum system
  • 2 Injection system
  • 2.1 Technical data
  • 2.2 Overview of fitting locations - injection system
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  • 3.1 Exploded view - intake manifold
  • 3.2 Removing and installing intake manifold
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Years: 2003 Manual in English Pages: 369 9.1 MB
Short description

Comprehensive workshop manual for the Audi A8 (2003) electrical system — Edition 08.2014. Covers battery, alternator, starter, instrument cluster, wiper/washer systems, exterior/interior lighting and wiring repair procedures with step-by-step illustrations. Includes diagnostic and adjustment procedures and torque/data specifications.

199,00 UAH
Contents
Key sections:
  • 27 - Starter, current supply, CCS
  • 1 Contact corrosion
  • 2 Battery
  • 2.1 Battery - general notes
  • 2.2 Maintenance-free batteries
  • 2.3 Disconnecting and connecting battery
  • 2.4 Removing and installing battery
  • - Remove luggage compartment side trim (right-side)
  • - Connect battery charger for back-up power
  • - Detach earth and positive cables, central venting hose
  • - Remove battery retainer plate and lift battery out
  • - Installation notes, adaptation via Vehicle diagnostic tester
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Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685

Workshop Manual
Years: 2021 Manual in English Pages: 186 82.7 MB
Short description

Official Audi Service Training self‑study programme SSP 685 for the Audi Q4 e‑tron (Type F4). Covers body, power units, power transmission, running gear, electrics & electronics, high‑voltage system, thermal management, driver assist and infotainment. Intended for internal service training and technical familiarisation; not a workshop repair manual.

199,00 UAH
Contents
Key sections:
  • Introduction
  • - Introduction to Audi Q4 e-tron
  • - Dimensions
  • Body
  • - Body structure and materials
  • - Joining techniques
  • - Securing high-voltage battery and force progression
  • - Body assembly (doors, rear lid, panoramic sunroof)
  • - Dash panel and centre console
  • Power units
  • - Technical data: rear electric motor (VX90)
  • - Technical data: front electric motor (VX89)
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Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)

Workshop Manual
Years: 2018 Manual in English Pages: 645 14.8 MB
Short description

Workshop manual for the Audi Q8 (2018) — Electrical System. Includes technical data, safety notes and step‑by‑step repair procedures for battery/charging, starter/alternator, lighting, washer/wiper and wiring. Edition 05.2019.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
  • 2.3 Contact corrosion
  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

199,00 UAH
Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Buy

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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Your experience will help others
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Code

P2135

HUMMER P — Powertrain

Throttle Position (TP) Sensor 1-2 Correlation

Brand: HUMMER
Type: P — Powertrain
Views: UK: 10 EN: 36 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty accelerator pedal position (APP) sensor/module
  • Faulty throttle position sensor (TPS) or electronic throttle body
  • Damaged wiring harness or connector (open, short to power/ground, high resistance, corrosion)
  • Poor or intermittent connector pin contact
  • Failed or intermittent PCM/engine control module
  • Water ingress or contamination at pedal or throttle connectors

Symptoms

  • MIL (Check Engine) illuminated
  • Reduced engine power / limp-home mode engaged
  • Poor throttle response, hesitation or surging
  • Engine may not respond to accelerator pedal or shows delayed response
  • Stored freeze-frame data showing pedal/throttle signal mismatch

What to check

  • Read all stored DTCs and freeze-frame data with a capable scan tool
  • Record live data: APP sensor channels and TPS channel while key on and while varying pedal/throttle
  • Verify ignition key state and throttle control inputs during code set (some systems require learning/reset after battery disconnect)
  • Visually inspect connectors and wiring for damage, corrosion, water, or loose pins at APP, throttle body and PCM
  • Wiggle test wiring harness while observing live sensor values for intermittent changes
  • Check for other related codes (CAN bus, power supply, ground faults)

Signal parameters

  • 5 V reference supply expected on sensor reference circuit (verify at connector)
  • Sensor outputs typically vary between ~0.5–4.5 V from closed to wide-open; both APP channels should change smoothly and proportionally
  • Secondary APP/TPS channel should track the primary channel within a small offset and show expected correlation (no sudden divergence)
  • At key on (engine off) some sensors will show a parked/closed voltage; compare to manufacturer spec

Diagnostic algorithm

  1. Connect a professional scan tool and record stored codes, freeze-frame, and live APP/TPS data. Note when the code set and under what conditions.
  2. Attempt to reproduce the fault while monitoring live data: press pedal slowly to full travel and observe both APP channels and TPS for smooth, correlated movement.
  3. Visually inspect APP and throttle body connectors and wiring for damage, corrosion, or water intrusion. Repair any visible damage.
  4. Back-probe the sensor connectors: with key ON (engine off) verify 5 V reference, signal voltages, and ground continuity. Compare voltages to expected range and check that both APP channels move proportionally.
  5. Perform a wiggle test on wiring and connectors while watching live data to locate intermittent short/open or high-resistance joints.
  6. If wiring and connectors check good, unplug sensors one at a time and observe behavior per factory procedure (some vehicles will log additional codes; follow OEM steps).
  7. Check continuity from sensor signal pins to the PCM and check for shorts to battery or ground. Repair any open/shorts found.
  8. If wiring and sensors test within spec, follow manufacturer procedure to test/replace throttle body or APP module. Replace the failed component only after verifying cause.
  9. After repair, clear codes, perform any required relearn/initialization procedure (throttle/A/T learn), and road-test to confirm the fault does not return.
  10. If fault persists after replacing sensors and repairing wiring, evaluate PCM operation or replace/flash only per factory guidance (consider PCM as last resort).

Likely causes

  • Damaged/loose connector or pin at APP or throttle body (most common)
  • Wiring harness chafing or short to ground/power
  • Failed APP sensor assembly
  • Failed throttle position sensor or throttle body motor assembly
  • Intermittent PCM input circuit fault (least common)

Fault status

⚠️ Status
PCM detected inconsistent or implausible correlation between accelerator pedal position and throttle position sensor signals; control strategy reduced engine power and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P2135

LAND ROVER P — Powertrain

Throttle Position Sensor A - Voltage Correlation

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 6 EN: 32 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty accelerator pedal position (APP) sensor/module
  • Faulty throttle position sensor (TPS) or electronic throttle body
  • Damaged wiring harness or connector (open, short to power/ground, high resistance, corrosion)
  • Poor or intermittent connector pin contact
  • Failed or intermittent PCM/engine control module
  • Water ingress or contamination at pedal or throttle connectors

Symptoms

  • MIL (Check Engine) illuminated
  • Reduced engine power / limp-home mode engaged
  • Poor throttle response, hesitation or surging
  • Engine may not respond to accelerator pedal or shows delayed response
  • Stored freeze-frame data showing pedal/throttle signal mismatch

What to check

  • Read all stored DTCs and freeze-frame data with a capable scan tool
  • Record live data: APP sensor channels and TPS channel while key on and while varying pedal/throttle
  • Verify ignition key state and throttle control inputs during code set (some systems require learning/reset after battery disconnect)
  • Visually inspect connectors and wiring for damage, corrosion, water, or loose pins at APP, throttle body and PCM
  • Wiggle test wiring harness while observing live sensor values for intermittent changes
  • Check for other related codes (CAN bus, power supply, ground faults)

Signal parameters

  • 5 V reference supply expected on sensor reference circuit (verify at connector)
  • Sensor outputs typically vary between ~0.5–4.5 V from closed to wide-open; both APP channels should change smoothly and proportionally
  • Secondary APP/TPS channel should track the primary channel within a small offset and show expected correlation (no sudden divergence)
  • At key on (engine off) some sensors will show a parked/closed voltage; compare to manufacturer spec

Diagnostic algorithm

  1. Connect a professional scan tool and record stored codes, freeze-frame, and live APP/TPS data. Note when the code set and under what conditions.
  2. Attempt to reproduce the fault while monitoring live data: press pedal slowly to full travel and observe both APP channels and TPS for smooth, correlated movement.
  3. Visually inspect APP and throttle body connectors and wiring for damage, corrosion, or water intrusion. Repair any visible damage.
  4. Back-probe the sensor connectors: with key ON (engine off) verify 5 V reference, signal voltages, and ground continuity. Compare voltages to expected range and check that both APP channels move proportionally.
  5. Perform a wiggle test on wiring and connectors while watching live data to locate intermittent short/open or high-resistance joints.
  6. If wiring and connectors check good, unplug sensors one at a time and observe behavior per factory procedure (some vehicles will log additional codes; follow OEM steps).
  7. Check continuity from sensor signal pins to the PCM and check for shorts to battery or ground. Repair any open/shorts found.
  8. If wiring and sensors test within spec, follow manufacturer procedure to test/replace throttle body or APP module. Replace the failed component only after verifying cause.
  9. After repair, clear codes, perform any required relearn/initialization procedure (throttle/A/T learn), and road-test to confirm the fault does not return.
  10. If fault persists after replacing sensors and repairing wiring, evaluate PCM operation or replace/flash only per factory guidance (consider PCM as last resort).

Likely causes

  • Damaged/loose connector or pin at APP or throttle body (most common)
  • Wiring harness chafing or short to ground/power
  • Failed APP sensor assembly
  • Failed throttle position sensor or throttle body motor assembly
  • Intermittent PCM input circuit fault (least common)

Fault status

⚠️ Status
PCM detected inconsistent or implausible correlation between accelerator pedal position and throttle position sensor signals; control strategy reduced engine power and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0120 P0121 P0122 P0123 P0220 P0221
Workshop Manuals

Repair manuals for LAND ROVER

3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
Buy

Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Buy

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Buy
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P2135

MITSUBISHI P — Powertrain

TPS(main/sub) correlation

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 7 EN: 39 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty accelerator pedal position (APP) sensor/module
  • Faulty throttle position sensor (TPS) or electronic throttle body
  • Damaged wiring harness or connector (open, short to power/ground, high resistance, corrosion)
  • Poor or intermittent connector pin contact
  • Failed or intermittent PCM/engine control module
  • Water ingress or contamination at pedal or throttle connectors

Symptoms

  • MIL (Check Engine) illuminated
  • Reduced engine power / limp-home mode engaged
  • Poor throttle response, hesitation or surging
  • Engine may not respond to accelerator pedal or shows delayed response
  • Stored freeze-frame data showing pedal/throttle signal mismatch

What to check

  • Read all stored DTCs and freeze-frame data with a capable scan tool
  • Record live data: APP sensor channels and TPS channel while key on and while varying pedal/throttle
  • Verify ignition key state and throttle control inputs during code set (some systems require learning/reset after battery disconnect)
  • Visually inspect connectors and wiring for damage, corrosion, water, or loose pins at APP, throttle body and PCM
  • Wiggle test wiring harness while observing live sensor values for intermittent changes
  • Check for other related codes (CAN bus, power supply, ground faults)

Signal parameters

  • 5 V reference supply expected on sensor reference circuit (verify at connector)
  • Sensor outputs typically vary between ~0.5–4.5 V from closed to wide-open; both APP channels should change smoothly and proportionally
  • Secondary APP/TPS channel should track the primary channel within a small offset and show expected correlation (no sudden divergence)
  • At key on (engine off) some sensors will show a parked/closed voltage; compare to manufacturer spec

Diagnostic algorithm

  1. Connect a professional scan tool and record stored codes, freeze-frame, and live APP/TPS data. Note when the code set and under what conditions.
  2. Attempt to reproduce the fault while monitoring live data: press pedal slowly to full travel and observe both APP channels and TPS for smooth, correlated movement.
  3. Visually inspect APP and throttle body connectors and wiring for damage, corrosion, or water intrusion. Repair any visible damage.
  4. Back-probe the sensor connectors: with key ON (engine off) verify 5 V reference, signal voltages, and ground continuity. Compare voltages to expected range and check that both APP channels move proportionally.
  5. Perform a wiggle test on wiring and connectors while watching live data to locate intermittent short/open or high-resistance joints.
  6. If wiring and connectors check good, unplug sensors one at a time and observe behavior per factory procedure (some vehicles will log additional codes; follow OEM steps).
  7. Check continuity from sensor signal pins to the PCM and check for shorts to battery or ground. Repair any open/shorts found.
  8. If wiring and sensors test within spec, follow manufacturer procedure to test/replace throttle body or APP module. Replace the failed component only after verifying cause.
  9. After repair, clear codes, perform any required relearn/initialization procedure (throttle/A/T learn), and road-test to confirm the fault does not return.
  10. If fault persists after replacing sensors and repairing wiring, evaluate PCM operation or replace/flash only per factory guidance (consider PCM as last resort).

Likely causes

  • Damaged/loose connector or pin at APP or throttle body (most common)
  • Wiring harness chafing or short to ground/power
  • Failed APP sensor assembly
  • Failed throttle position sensor or throttle body motor assembly
  • Intermittent PCM input circuit fault (least common)

Fault status

⚠️ Status
PCM detected inconsistent or implausible correlation between accelerator pedal position and throttle position sensor signals; control strategy reduced engine power and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0120 P0121 P0122 P0123 P0220 P0221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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