P0716 on 2022-2026 Ram 1500: Input Speed Sensor Fault Causes and Fixes

What's Unique About the 2022-2026 Ram 1500

The 2022-2026 Ram 1500 exclusively uses 8-speed automatic transmissions (like the ZF-designed 8HP75 for V8s and the Stellantis-built 850RE for V6s) where the input speed sensor is not a simple, externally accessible part. Instead, it is integrated into the internal mechatronics/valve body assembly. This makes diagnosis and repair significantly more complex and expensive than on older trucks with 6-speed transmissions (like the 65RFE), where the sensor was often an inexpensive external part. Manufacturer service bulletins confirm that P0716 is a known issue for these specific transmissions. [Bulletin #S2621000003 REV.A]

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light or Transmission Warning Light is on.
• Harsh, erratic, or delayed shifting.
• Transmission is stuck in one gear (limp mode), often 2nd or 3rd gear.
• Reduced acceleration and engine revs higher than normal.
• Grinding or whining noises during acceleration.
• Vehicle may stall when coming to a stop.

Most Likely Causes

1. Faulty Internal Transmission Components (Sensor/Harness/Valve Body) 🔴 High Probability The speed sensors on the 8-speed transmissions used in these trucks are integrated into the internal mechatronics (valve body) unit. Technical Service Bulletins for these trucks group P0716 with other codes, pointing to a known pattern of internal faults that often lead to valve body replacement. [Bulletin #S2621000003 REV.A]
   How to confirm: A professional technician will use a high-end scan tool to monitor live data from the input speed sensor. If the reading is erratic, drops to zero, or is irrational compared to engine RPM, the internal components are suspect. Visual inspection of the valve body and harness is required after removing the transmission pan.
   Typical fix: In most cases, the entire valve body assembly (which includes the sensors and internal harness) must be replaced. This is a complex job requiring removal of the transmission pan and the old unit, followed by programming the new module 🎬 See this walkthrough for installing the new valve body assembly. to the vehicle.
   Est. part cost: $800 - $1600
2. Low or Contaminated Transmission Fluid 🟡 Medium Probability While not specific to this platform, any transmission can suffer from low or contaminated fluid. Debris in the fluid can interfere with the magnetic pickup of the speed sensor, causing erratic readings.
   How to confirm: Check the transmission fluid level and condition according to the manufacturer's procedure. The fluid should be at the correct level, have its specified color (Mopar 8&9 Speed ATF is typically light brown/amber, not red), and not smell burnt or contain excessive metallic debris.
   Typical fix: Perform a transmission fluid drain and fill or a complete fluid exchange. If the fluid is heavily contaminated, the pan must be dropped for cleaning and filter replacement.
   Est. part cost: $150 - $400
3. Transmission Control Module (TCM) Software Issue ⚪ Low Probability Manufacturers sometimes release software updates to correct logic errors that can falsely trigger performance codes. While more common on slightly older models, it's still a possibility and should be checked before expensive hardware replacement.
   How to confirm: A dealership or qualified shop can check for any available TCM software updates using the vehicle's VIN.
   Typical fix: Reprogramming the TCM with the latest software version. This is often done as a first step at the dealership.
   Est. part cost: $100 - $250

Rare But Worth Checking

• Wiring or Connector Issues External to Transmission: Damage to the main transmission wiring harness from road debris, heat, or rodent activity (chewing on soy-based wire insulation) can cause an intermittent signal, mimicking an internal sensor failure. It's worth inspecting the external wiring before committing to an internal transmission repair.
• Internal Mechanical Failure: In some cases, a failing clutch pack or other mechanical issue can create debris that interferes with the magnetic speed sensor, or cause speeds that the TCM deems irrational. This is a worst-case scenario that usually comes with more severe symptoms like grinding noises or slipping.

Diagnosis Steps

1. Check the transmission fluid level and condition. Low, old, or burnt fluid can cause numerous issues.
2. Use an OBD-II scanner to check for any other transmission-related trouble codes. Note all codes present, especially those listed in TSB S2621000003 REV.A.
3. Use an advanced scan tool to monitor the live data stream for the Input Speed Sensor and Output Speed Sensor.
4. Compare the Input Speed Sensor RPM to the Engine RPM. With the vehicle stopped and in gear, they should be nearly identical. While driving, the reading should be smooth and rational, not erratic or dropping to zero.
5. Visually inspect the main transmission wiring harness and its connectors for any signs of damage, corrosion, or loose pins. Perform a 'wiggle test' on the harness while monitoring live data.
6. If external wiring is fine and the sensor data is erratic, the next step is to have a professional inspect the internal components, which involves removing the transmission pan to access the valve body, internal harness, and sensors.

Parts You'll Likely Need

• Transmission Mechatronics Unit / Valve Body Assembly (OEM #Varies by VIN (e.g., 68472274AB, R8259301AC). Must be verified.) — For the 8-speed transmissions (8HP75, 850RE) used in these trucks, the input and output speed sensors are integrated into this internal assembly. A P0716 code often requires replacing the entire unit.
  Trusted brands: Mopar, ZF
  OEM price range: $1000 - $1600
  Aftermarket price range: $800 - $1200
• Automatic Transmission Fluid (OEM #68218925AB (replaces 68218925AA)) — The correct type and amount of fluid (Mopar ZF 8&9 Speed ATF or equivalent) is required when replacing the valve body or servicing the transmission.
  Trusted brands: Mopar, Liqui Moly, Valvoline
  OEM price range: $25 - $40 per quart
  Aftermarket price range: $15 - $25 per quart

Related Codes That Often Appear With This One

• P0733 — This code indicates an incorrect gear ratio for 3rd gear. The TCM may set this if the faulty input speed sensor data prevents it from confirming the transmission is in the correct gear. It is listed in the same TSB as P0716. [9, Bulletin #S2621000003 REV.A]
• P0717 — This code means 'Input/Turbine Speed Sensor Circuit No Signal'. It often appears with P0716, indicating the signal is not just erratic but is completely lost at times.
• P0721 — This is a range/performance code for the Output Speed Sensor. Since the TCM constantly compares input and output speeds, a fault in one can sometimes trigger a performance code for the other.
• P07E4, P1DB2, P1B14, P1D90, P1DB7, P1B13 — These codes are listed alongside P0716 in manufacturer TSBs for the 8-speed transmissions, indicating they are part of a known cluster of related transmission faults. [Bulletin #S2621000003 REV.A, #S2621000003]

Technical Service Bulletins (TSBs) & Recalls

• S2621000003 REV.A
• S2621000003

Platform-Specific Known Issues

• TSB Confirmed Issue: A Technical Service Bulletin (TSB #S2621000003 REV.A) issued by the manufacturer explicitly lists P0716 as a potential diagnostic code for a wide range of 8-speed transmissions used in 2022 model year trucks, including the 850RE, 8HP75, and others. This confirms it is a recognized issue. [Bulletin #S2621000003 REV.A]
• Owner Experience: Valve Body Replacement: Multiple owners on forums like 5thgenrams.com report experiencing P0716 along with harsh shifting, leading to a dealership diagnosis of a failed valve body. For trucks under warranty, this is typically replaced. For those out of warranty, owners report dealership quotes ranging from $2,500 to over $3,500 for the complete repair.

Mechanic-Grade Diagnostic Values

• Input Speed Sensor RPM vs. Engine RPM (Live Scan Tool Data) — expected: With the vehicle stopped and in gear (Drive or Reverse), the Input Speed Sensor RPM should be nearly identical to the Engine RPM. While accelerating, the reading should be smooth and proportional, not jumping erratically or dropping to zero.. Failure: An erratic, intermittent, or zero RPM reading from the input speed sensor while engine RPM is steady and above idle indicates a fault.
• Sensor Ground Circuit Voltage — expected: Below 0.5 volts.. Failure: Voltage significantly above 0.5 volts points to a short to voltage in the ground circuit, which can cause erratic sensor readings.

Scan Tool Commands That Help

• Witech 2.0, AlfaOBD, Autel, or other professional scan tools: Reset Adaptive Values — This procedure must be run first, before the Quick Learn, after replacing the valve body/mechatronics unit. It clears the old, learned clutch fill times and pressures from the TCM's memory.
• Witech 2.0, AlfaOBD, Autel, or other professional scan tools: Quick Learn Procedure — This is a mandatory procedure after replacing the valve body or clearing adaptive values. The tool guides the technician through a series of steps (applying brake, shifting into D, N, R as prompted) to allow the TCM to perform a baseline calibration of the new clutches and solenoids. Failure to perform this will result in poor shift quality.

Wiring & Ground Locations

• Main Transmission Harness Connector — On the driver's side of the transmission case, where the main vehicle harness connects to the transmission's internal wiring.. This is the primary external electrical connection for the entire mechatronics unit, including the integrated input speed sensor. A visual inspection for corrosion, pushed-out pins, or harness damage at this connector is a critical first step before condemning the internal valve body.

"I Checked Everything" — The Actual Cause

• For this electronic transmission code, the equivalent of a 'smoke test clean' scenario is when external wiring and fluid checks are normal, yet the code persists. In the vast majority of these cases for the 8HP/850RE transmissions, the root cause is an internal failure of the mechatronics/valve body assembly, which is not externally verifiable without replacement.

OEM Part Supersession History

• R8259301AA, R8259301AB → R8259301AC — Updated/revised part from the manufacturer for improved reliability or to address known issues.
  Heads up: This part number is typically for the 850RE transmission used with the 3.6L V6 engine. Always verify fitment with the vehicle's VIN.
• 68227332AA, 68227332AB, 68227332AC → 68227332AD (and others) — Multiple revisions of the valve body exist for the V8 engine's transmission.
  Heads up: These part numbers are associated with the 8HP70/8HP75 transmission used with the 5.7L V8 HEMI. Due to numerous revisions, it is absolutely critical to match the part number to the vehicle's VIN to ensure compatibility.

Model Year Variations Within This Range

• 2022-2026: The primary variation within this model range is the specific 8-speed transmission used, which is dependent on the engine. V6 models are typically equipped with the Stellantis-built 850RE, while V8 models use the ZF-built 8HP75. While the P0716 code applies to both and the repair procedure is the same (valve body replacement), the specific valve body part numbers are different and not interchangeable.