P0732 on 2024 Ram 2500: Gear 2 Incorrect Ratio Causes and Fixes

What's Unique About the 2024-2024 Ram 2500

For the 2024 Ram 2500 with the 68RFE transmission, this code is particularly significant due to a critical service bulletin. TSB #21-012-25 REV. A applies to trucks built between June 14, 2024, and September 04, 2024. It states that P0732 (along with other ratio codes) can be caused by a 'Rear selective thrust bearing cracking'. In this specific case, the bulletin advises complete transmission replacement as the sole remedy, highlighting the potential severity. For trucks outside this build range, the code points to more common 68RFE issues like solenoid failure or wear in the 2C clutch pack.

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 is on
• Delayed, harsh, or failed shifts into 2nd gear
• Transmission slipping while in gear, engine RPMs flare without an increase in speed
• Vehicle enters "limp mode" (stuck in one gear, often 4th)
• Shudder or lurch when shifting into 2nd gear
• Poor acceleration
• Decreased fuel economy

Most Likely Causes

1. Low or Dirty Transmission Fluid 🔴 High Probability Fluid is the hydraulic lifeblood of the transmission. Low levels or fluid contaminated with clutch material or metal shavings prevents proper hydraulic pressure, causing slippage. The 68RFE is sensitive to fluid condition, and since there is no dipstick, levels are often overlooked.
   How to confirm: A technician must follow a specific procedure to check the fluid level and condition, typically with the vehicle running and at a specific temperature. The fluid should be bright red and clear (Mopar ATF+4), not brown, black, or smelling burnt.
   Typical fix: Perform a transmission fluid and filter change using the correct Mopar ATF+4 fluid. If the pan contains significant metal or clutch debris, it's a sign of a more serious internal failure.
   Est. part cost: $100-$300
2. Faulty Shift Solenoid / Solenoid Pack 🟡 Medium Probability The 68RFE solenoid pack is a known failure point. These electronic valves direct fluid flow to engage gears. The solenoid for 2nd gear can fail electronically or become clogged with debris, preventing proper gear engagement.
   How to confirm: A professional technician can command the solenoid on and off with a diagnostic scan tool and monitor pressure changes. The solenoid's internal resistance can also be tested. This part can be replaced by dropping the transmission pan without removing the transmission.
   Typical fix: Replace the entire transmission solenoid pack. For 2019+ models, the OEM part number is typically 68456067AA.
   Est. part cost: $200-$600
3. Internal Mechanical Failure (e.g., 2C Clutch Pack, Thrust Bearing) 🟡 Medium Probability For trucks equipped with the 68RFE, the 2C clutch pack (used for 2nd and 6th gear) is a known weak point. The piston seals can tear or the clutch plates can wear out, especially under heavy use, causing slippage. Additionally, TSB #21-012-25 REV. A points to a cracked rear thrust bearing on some 2024 models.
   How to confirm: This is a diagnosis of exclusion after external components and fluid have been checked. Dropping the transmission pan and finding significant amounts of black, gritty clutch material is a strong indicator. A technician can also use a scan tool to check Clutch Volume Index (CVI) values; numbers trending higher over time suggest a leak and clutch wear.
   Typical fix: For the TSB issue, complete transmission replacement is required. For a failed 2C clutch, a complete transmission rebuild or replacement is necessary.
   Est. part cost: $3000-$8000+
4. Powertrain Control Module (PCM) Software Issue ⚪ Low Probability While less common for this specific code on the 2024 model, other model years have had TSBs to correct false ratio codes or harsh shifting via software updates. It remains a possibility if no other cause is found.
   How to confirm: A Ram dealership or a qualified shop with access to OEM software (wiTECH) can check the current software version on the vehicle's PCM/TCM and compare it against the latest available version.
   Typical fix: Update or reflash the Powertrain Control Module (PCM) or Transmission Control Module (TCM) with the latest software version.
   Est. part cost: $0-$250

Rare But Worth Checking

• Faulty Input/Output Speed Sensor: While a sensor can fail, it's more common for it to trigger its own specific code (like P0716 for an input speed sensor circuit). However, an intermittent sensor could potentially provide erroneous data that leads to a P0732 without setting a separate sensor code.
• Damaged Wiring or Connectors: A corroded connector or damaged wire leading to a shift solenoid or speed sensor can cause intermittent and incorrect signals, leading the TCM to believe there is a gear ratio error.
• Stuck Main Pressure Regulator Valve: Debris in the transmission fluid can cause the main pressure regulator valve inside the pump to stick in a bypass position. This prevents the transmission from building adequate line pressure, leading to clutch slippage and codes like P0868 (Low Line Pressure) along with P0732.

Diagnosis Steps

1. Check for applicable Technical Service Bulletins (TSBs), especially #21-012-25 REV. A, by VIN to see if the vehicle falls under the transmission replacement advisory.
2. Use a professional scan tool to check for any other pending or active trouble codes, paying close attention to pressure or sensor codes.
3. Check and verify the transmission fluid level and condition. This must be done following the specific OEM procedure. Top off or replace as necessary.
4. Inspect the transmission pan for excessive metal or clutch debris. The presence of significant debris points to internal mechanical failure.
5. With a scan tool, monitor the input and output speed sensors in real-time to ensure they are reading correctly and check Clutch Volume Index (CVI) values for the 2C clutch. A high or rapidly increasing CVI indicates wear.
6. Perform a line pressure test to determine if hydraulic pressure is within specification. Low pressure confirms a hydraulic issue.
7. If other tests are inconclusive, test the shift solenoid circuit and consider replacing the solenoid pack, as it is a common failure item and accessible without transmission removal.
8. If all other tests pass or significant debris was found, the issue is an internal mechanical fault, requiring transmission removal and inspection/rebuild.

Parts You'll Likely Need

• Transmission Fluid and Filter Kit (OEM #Kit may include Sump Filter 5013470AE and Spin-On Filter 5179267AD. Requires Mopar ATF+4 Fluid.) 🎬 Watch: Step-by-step transmission fluid change and deep pan install — This is the most common and first-line fix for many transmission shifting issues, including P0732.
  Trusted brands: Mopar, Valvoline, Castrol
  OEM price range: $150-$250
  Aftermarket price range: $100-$180
• Transmission Solenoid Pack (OEM #68456067AA (for 2019+ models)) — A failed solenoid is a common cause for the inability to engage a spe

Related Codes That Often Appear With This One

• P0731 — Incorrect Ratio in 1st Gear. Often appears with other ratio codes when there is a systemic issue like low fluid, a failing solenoid pack, or a major mechanical problem.
• P0736 — Incorrect Ratio in Reverse. The 2C clutch, which fails and causes P0732, is also used in 6th gear, not reverse. However, seeing multiple ratio codes points to a broader issue.
• P0868 — Transmission Fluid Pressure Low. This code directly points to a lack of hydraulic pressure, which is the root cause of the clutch slippage that triggers P0732. It can be caused by low fluid, a stuck pressure regulator valve, or a major internal leak.
• P0944 — Loss of Hydraulic Pump Prime. This severe code indicates the transmission pump is not able to supply pressure. It is listed in TSB #21-012-25 REV. A as a related code pointing to catastrophic failure.

Technical Service Bulletins (TSBs) & Recalls

• Bulletin #21-012-25 REV. E: Addresses multiple incorrect gear ratio DTCs, including P0732, which may be resolved by a PCM software update or, in some specific 2024 models, require transmission replacement.

Platform-Specific Known Issues

• TSB #21-012-25 REV. A is critical for 2024 Ram 2500/3500s built between June and September 2024. It indicates that P0732 can be caused by a cracked rear selective thrust bearing, and the only fix is to replace the entire transmission.
• The 2C clutch pack within the 68RFE is a well-documented weak point that causes slipping in 2nd and 6th gear, leading to code P0732. Forum discussions confirm this is a common failure requiring a rebuild.

Mechanic-Grade Diagnostic Values

• 2C Clutch Volume Index (CVI) — expected: 46 - 73 (for Alternate 2C CVI). Failure: A CVI value that is consistently trending higher over time, or is already well above 73, indicates a hydraulic leak in the 2C clutch circuit, pointing to worn seals or clutch pack.
• Transmission Temperature Sensor Resistance — expected: ~2500 Ohms at 68°F (20°C). Failure: A resistance reading significantly outside of this value can indicate a faulty sensor, which may cause the TCM to calculate pressures incorrectly.

Scan Tool Commands That Help

• wiTECH or equivalent (Launch, Autel): Quick Learn / Adaptive Learn — This function must be performed after replacing the transmission, valve body, or solenoid pack. It allows the TCM to learn the hydraulic and mechanical characteristics of the new components. Failure to perform a Quick Learn can cause harsh shifts, incorrect CVI readings, and may trigger new fault codes.
• wiTECH or equivalent: Read Clutch Volume Index (CVI) — This is a primary diagnostic step for any ratio code. It reads the stored values for the volume of fluid required to apply each clutch. It provides a direct measurement of clutch pack wear without disassembly.
• wiTECH or equivalent: Solenoid Actuation Test — This bidirectional control allows a technician to command a specific shift solenoid on and off while monitoring hydraulic pressure to confirm if the solenoid is functioning electrically and mechanically.

Wiring & Ground Locations

• Transmission Main Connector — On the driver's side of the 68RFE transmission case, typically a large, round 23-pin connector.. This is the single point of connection for all electronic signals to and from the transmission, including speed sensors and solenoids. Corrosion, moisture intrusion, or pushed-out pins in this connector can directly cause P0732 and other transmission codes.
• Chassis Ground — Key grounds are typically located on the frame rail below the driver's door and near the battery.. The TCM and its sensors rely on a clean ground connection. A loose or corroded ground can introduce electrical noise or voltage drops, causing the TCM to receive erroneous data from the speed sensors, leading to a false ratio code.

Real Owner Repair Stories

• Turbo Diesel Register forum (2011 Ram 3500 with 68RFE (similar design)) — Vehicle got stuck in 4th gear, then after a restart, it would hunt for gears between 1st and 2nd and had rapid lockup issues in 6th. Codes P1790 and P0732 were present.
  ❌ Tried (didn't work) The owner first suspected external issues before seeking forum advice.
  ✅ What actually fixed it The diagnosis pointed directly to a failure of the 2C clutch, which is used in both 2nd and 6th gear. The recommended and ultimate fix was a complete transmission teardown and rebuild to replace the burned 2C clutch pack and the failed piston seals.

OEM Part Supersession History

• 68456067AA → 68456067AB — Part revision for improved reliability or manufacturing process change.
  Heads up: Part number 68456067AA (and its successor 68456067AB) is only for 2019 and newer Ram trucks with the 68RFE. These models use a different valve body design. This solenoid pack is not backward compatible with pre-2019 models.

Model Year Variations Within This Range

• 2019-2024: Starting in 2019, the 68RFE received an updated valve body and a new solenoid pack (PN 68456067AA). When replacing this solenoid, a unique 46-character code from the new solenoid must be programmed into the TCM using a scan tool to ensure proper torque converter lock-up control.