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Home / DTC / P0845 — Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue

P0845 — Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue

Detailed page for trouble code P0845.

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Code

P0845

AUDI P — Powertrain

Transmission Control Module (TCM) failure, Transmission fluid level is low, Transmission fluid pressure sensor failure, Wiring issue

Brand: AUDI
Type: P — Powertrain
Views: UK: 24 EN: 48 RU: 47
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low or contaminated transmission fluid level
  • Faulty transmission fluid pressure sensor/switch
  • Open/short/corroded wiring or poor connector/ground to sensor
  • Internal transmission hydraulic problem (clogged valve/screen, internal leak)
  • TCM software fault or module failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Transmission enters limp/diagnostic mode or limits gear selection
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or inability to hold gear
  • Transmission temperature warning or unusual noise in severe cases

What to check

  • Read and record freeze frame and pending codes with a capable scan tool
  • Check transmission fluid level, color and smell; confirm correct fluid and service interval
  • Visually inspect sensor connector and harness for corrosion, damage, pin push-out or water intrusion
  • Scan live data: monitor transmission fluid pressure sensor voltage and related parameters while key ON and during gear changes
  • Check for related codes (TCM, speed sensors, grounds) and consult manufacturer service information/TSBs
  • Perform wiggle/rock test on harness while observing live data for intermittent changes

Signal parameters

  • Sensor reference: typical 5 V reference from TCM (verify with manufacturer data)
  • Signal voltage: commonly in the ~0.5–4.5 V range proportional to pressure (varies by model; check AUDI spec)
  • Signal behavior: voltage should change smoothly with gear changes/load; stuck, spiking, or constant values indicate fault
  • Circuit resistance: check harness continuity to TCM and resistance to ground per OEM specs

Diagnostic algorithm

  1. Connect scan tool, record codes, freeze frame and live data; note conditions when fault set
  2. Consult manufacturer service information and TSBs for known faults or required software updates to the TCM
  3. Check and, if necessary, correct transmission fluid level and condition; top or change fluid and filter if contaminated
  4. Perform visual inspection of sensor, connector and harness; repair any corrosion, frayed wires or poor grounds
  5. Back-probe sensor connector: with ignition ON (engine OFF) verify reference voltage (~5V), ground continuity, and monitor signal voltage while an assistant cycles selector or starts engine; compare to expected behavior
  6. If signal is out-of-range, check continuity and shorts between sensor and TCM; repair wiring as needed
  7. If wiring and connector good but signal still invalid, perform a mechanical transmission pressure test with a calibrated gauge to confirm actual hydraulic pressure
  8. If mechanical pressure and sensor signal disagree, replace the pressure sensor and retest
  9. Clear codes and perform a road test and re-scan. If code returns and wiring/sensor verified, consider TCM diagnostics/software reflash or replacement per OEM procedures
  10. Document repairs and verify no additional codes remain before returning vehicle to service

Likely causes

  • Low fluid level or incorrect fluid type
  • Corroded or loose sensor connector or damaged harness
  • Faulty pressure sensor producing no or incorrect voltage signal
  • Intermittent contact or short to +12V/ground in sensor circuit
  • TCM input circuit failure or incorrect calibration

Fault status

⚠️ Status
P0845 — Transmission pressure sensor circuit out-of-range. Possible low fluid, sensor or wiring fault; verify fluid, inspect wiring/connectors, compare sensor signal to mechanical pressure, and continue diagnosis.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.5 hours

Similar codes

P0700 P0715 P0720 P0840 P0841
Workshop Manuals

Repair manuals for AUDI

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6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)

Workshop Manual
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
  • 1.1 Gearbox identification
  • 2 Technical data
  • 2.1 Allocation of gearbox to engine
  • 2.1.1 Allocation - Audi A4 2008 ►
  • 2.1.2 Allocation - Audi A5 Coupé 2008 ►, Audi A5 Sportback 2010 ►
  • 2.1.3 Allocation - Audi A5 Cabriolet 2009 ►
  • 2.1.4 Allocation - Audi Q5 2008 ►
  • 2.2 Capacities
  • 3 Transmission layout
  • 3.1 Transmission layout - front‑wheel drive
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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

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.

199,00 UAH
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
  • 1.1 Removing and installing engine ....................................3
  • 1.2 Removing - vehicles with engine codes AEH, AKL .....................4
  • 1.3 Removing - vehicles with engine code APF ..........................18
  • 1.4 Detaching engine from gearbox ...................................35
  • 1.5 Attaching engine to repair stand ................................38
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AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017

Workshop Manual
Years: 2004 Manual in English Pages: 235 3.8 MB
Short description

Official workshop manual for the Audi A3 2.0L FSI turbo engine (mechanics). Includes step‑by‑step removal/install procedures, technical data, tightening torques and diagnostic/repair instructions. Intended for professional garages and experienced technicians.

199,00 UAH
Contents
Key sections:
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  • 1 Engine number
  • 2 Engine data (code letters AXX, BPY, BWA, BHZ, BZC, CDL — capacity, power, torque, bore/stroke, compression, ignition)
  • 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
  • 3.4 Using testers during road test
  • 3.5 Working on the exhaust system
  • 4 General repair instructions
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Short description

Workshop manual for the Audi A3 (2004) — Electrical system. Includes procedures for battery, starter, alternator, gauges, wipers, exterior/interior lighting and wiring. Edition 02.2018.

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Key sections:
  • List of Workshop Manual Repair Groups
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Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007

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.

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Contents
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  • 3 Safety precautions
  • 4 General repair instructions (cleanliness, fuel system, contact corrosion)
  • 10 - Removing and installing engine
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  • - Remove luggage compartment side trim (right-side)
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Code

P0845

Generic P — Powertrain

Transmission Fluid Pressure Sensor/Switch B Circuit

Brand: Generic
Type: P — Powertrain
Views: UK: 21 EN: 55 RU: 46
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low or contaminated transmission fluid level
  • Faulty transmission fluid pressure sensor/switch
  • Open/short/corroded wiring or poor connector/ground to sensor
  • Internal transmission hydraulic problem (clogged valve/screen, internal leak)
  • TCM software fault or module failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Transmission enters limp/diagnostic mode or limits gear selection
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or inability to hold gear
  • Transmission temperature warning or unusual noise in severe cases

What to check

  • Read and record freeze frame and pending codes with a capable scan tool
  • Check transmission fluid level, color and smell; confirm correct fluid and service interval
  • Visually inspect sensor connector and harness for corrosion, damage, pin push-out or water intrusion
  • Scan live data: monitor transmission fluid pressure sensor voltage and related parameters while key ON and during gear changes
  • Check for related codes (TCM, speed sensors, grounds) and consult manufacturer service information/TSBs
  • Perform wiggle/rock test on harness while observing live data for intermittent changes

Signal parameters

  • Sensor reference: typical 5 V reference from TCM (verify with manufacturer data)
  • Signal voltage: commonly in the ~0.5–4.5 V range proportional to pressure (varies by model; check AUDI spec)
  • Signal behavior: voltage should change smoothly with gear changes/load; stuck, spiking, or constant values indicate fault
  • Circuit resistance: check harness continuity to TCM and resistance to ground per OEM specs

Diagnostic algorithm

  1. Connect scan tool, record codes, freeze frame and live data; note conditions when fault set
  2. Consult manufacturer service information and TSBs for known faults or required software updates to the TCM
  3. Check and, if necessary, correct transmission fluid level and condition; top or change fluid and filter if contaminated
  4. Perform visual inspection of sensor, connector and harness; repair any corrosion, frayed wires or poor grounds
  5. Back-probe sensor connector: with ignition ON (engine OFF) verify reference voltage (~5V), ground continuity, and monitor signal voltage while an assistant cycles selector or starts engine; compare to expected behavior
  6. If signal is out-of-range, check continuity and shorts between sensor and TCM; repair wiring as needed
  7. If wiring and connector good but signal still invalid, perform a mechanical transmission pressure test with a calibrated gauge to confirm actual hydraulic pressure
  8. If mechanical pressure and sensor signal disagree, replace the pressure sensor and retest
  9. Clear codes and perform a road test and re-scan. If code returns and wiring/sensor verified, consider TCM diagnostics/software reflash or replacement per OEM procedures
  10. Document repairs and verify no additional codes remain before returning vehicle to service

Likely causes

  • Low fluid level or incorrect fluid type
  • Corroded or loose sensor connector or damaged harness
  • Faulty pressure sensor producing no or incorrect voltage signal
  • Intermittent contact or short to +12V/ground in sensor circuit
  • TCM input circuit failure or incorrect calibration

Fault status

⚠️ Status
P0845 — Transmission pressure sensor circuit out-of-range. Possible low fluid, sensor or wiring fault; verify fluid, inspect wiring/connectors, compare sensor signal to mechanical pressure, and continue diagnosis.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.5 hours

Similar codes

P0700 P0715 P0720 P0840 P0841
Workshop Manuals

Available brands with manuals

2
AUDI 11

6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)

Workshop Manual
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
  • 1.1 Gearbox identification
  • 2 Technical data
  • 2.1 Allocation of gearbox to engine
  • 2.1.1 Allocation - Audi A4 2008 ►
  • 2.1.2 Allocation - Audi A5 Coupé 2008 ►, Audi A5 Sportback 2010 ►
  • 2.1.3 Allocation - Audi A5 Cabriolet 2009 ►
  • 2.1.4 Allocation - Audi Q5 2008 ►
  • 2.2 Capacities
  • 3 Transmission layout
  • 3.1 Transmission layout - front‑wheel drive
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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

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.

199,00 UAH
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
  • 1.1 Removing and installing engine ....................................3
  • 1.2 Removing - vehicles with engine codes AEH, AKL .....................4
  • 1.3 Removing - vehicles with engine code APF ..........................18
  • 1.4 Detaching engine from gearbox ...................................35
  • 1.5 Attaching engine to repair stand ................................38
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AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017

Workshop Manual
Years: 2004 Manual in English Pages: 235 3.8 MB
Short description

Official workshop manual for the Audi A3 2.0L FSI turbo engine (mechanics). Includes step‑by‑step removal/install procedures, technical data, tightening torques and diagnostic/repair instructions. Intended for professional garages and experienced technicians.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Engine number
  • 2 Engine data (code letters AXX, BPY, BWA, BHZ, BZC, CDL — capacity, power, torque, bore/stroke, compression, ignition)
  • 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
  • 3.4 Using testers during road test
  • 3.5 Working on the exhaust system
  • 4 General repair instructions
  • 4.1 Cleanliness rules for fuel/injection/turbo
  • 4.2 Checking fuel system for leaks
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Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)

Workshop Manual
Years: 2004 Manual in English Pages: 150 68.2 MB
Short description

Workshop manual for the Audi A3 (2004) — Electrical system. Includes procedures for battery, starter, alternator, gauges, wipers, exterior/interior lighting and wiring. Edition 02.2018.

199,00 UAH
Contents
Key sections:
  • List of Workshop Manual Repair Groups
  • - 27 Starter, current supply, CCS
  • - 90 Gauges, instruments
  • - 92 Windscreen wash/wipe system
  • - 94 Lights, bulbs, switches - exterior
  • - 96 Lights, bulbs, switches - interior
  • - 97 Wiring
  • 27 - Starter, current supply, CCS
  • 1 Contact corrosion
  • 2 Battery
  • 2.1 Battery - general notes
  • 2.2 Maintenance-free batteries
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Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007

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)
  • 2 Removing and installing engine - vehicles with automatic gearbox (procedure parallels manual gearbox with ATF/torque converter notes)
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Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)

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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Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)

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
  • 3 Intake manifold
  • 3.1 Exploded view - intake manifold
  • 3.2 Removing and installing intake manifold
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Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)

Workshop Manual
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
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  • - Body assembly (doors, rear lid, panoramic sunroof)
  • - Dash panel and centre console
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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
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  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
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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:
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  • 1 Repair Information
  • 1.1 General Repair Information
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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
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
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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
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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
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  • 1.6 Abbreviations
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Code

P0845

MERCEDES-BENZ P — Powertrain

Trans Fluid Press Sensor/Switch B Circuit Malfunction

Brand: MERCEDES-BENZ
Type: P — Powertrain
Views: UK: 15 EN: 33 RU: 34
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low or contaminated transmission fluid level
  • Faulty transmission fluid pressure sensor/switch
  • Open/short/corroded wiring or poor connector/ground to sensor
  • Internal transmission hydraulic problem (clogged valve/screen, internal leak)
  • TCM software fault or module failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Transmission enters limp/diagnostic mode or limits gear selection
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or inability to hold gear
  • Transmission temperature warning or unusual noise in severe cases

What to check

  • Read and record freeze frame and pending codes with a capable scan tool
  • Check transmission fluid level, color and smell; confirm correct fluid and service interval
  • Visually inspect sensor connector and harness for corrosion, damage, pin push-out or water intrusion
  • Scan live data: monitor transmission fluid pressure sensor voltage and related parameters while key ON and during gear changes
  • Check for related codes (TCM, speed sensors, grounds) and consult manufacturer service information/TSBs
  • Perform wiggle/rock test on harness while observing live data for intermittent changes

Signal parameters

  • Sensor reference: typical 5 V reference from TCM (verify with manufacturer data)
  • Signal voltage: commonly in the ~0.5–4.5 V range proportional to pressure (varies by model; check AUDI spec)
  • Signal behavior: voltage should change smoothly with gear changes/load; stuck, spiking, or constant values indicate fault
  • Circuit resistance: check harness continuity to TCM and resistance to ground per OEM specs

Diagnostic algorithm

  1. Connect scan tool, record codes, freeze frame and live data; note conditions when fault set
  2. Consult manufacturer service information and TSBs for known faults or required software updates to the TCM
  3. Check and, if necessary, correct transmission fluid level and condition; top or change fluid and filter if contaminated
  4. Perform visual inspection of sensor, connector and harness; repair any corrosion, frayed wires or poor grounds
  5. Back-probe sensor connector: with ignition ON (engine OFF) verify reference voltage (~5V), ground continuity, and monitor signal voltage while an assistant cycles selector or starts engine; compare to expected behavior
  6. If signal is out-of-range, check continuity and shorts between sensor and TCM; repair wiring as needed
  7. If wiring and connector good but signal still invalid, perform a mechanical transmission pressure test with a calibrated gauge to confirm actual hydraulic pressure
  8. If mechanical pressure and sensor signal disagree, replace the pressure sensor and retest
  9. Clear codes and perform a road test and re-scan. If code returns and wiring/sensor verified, consider TCM diagnostics/software reflash or replacement per OEM procedures
  10. Document repairs and verify no additional codes remain before returning vehicle to service

Likely causes

  • Low fluid level or incorrect fluid type
  • Corroded or loose sensor connector or damaged harness
  • Faulty pressure sensor producing no or incorrect voltage signal
  • Intermittent contact or short to +12V/ground in sensor circuit
  • TCM input circuit failure or incorrect calibration

Fault status

⚠️ Status
P0845 — Transmission pressure sensor circuit out-of-range. Possible low fluid, sensor or wiring fault; verify fluid, inspect wiring/connectors, compare sensor signal to mechanical pressure, and continue diagnosis.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.5 hours

Similar codes

P0700 P0715 P0720 P0840 P0841
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