P0842 on 2007-2017 Jeep Compass: Transmission Pressure Sensor Circuit Low Causes and Fixes

What's Unique About the 2007-2017 Jeep Compass

The 2007-2017 Jeep Compass uses a Jatco JF011E Continuously Variable Transmission (CVT), also known as the CVT2. For this specific transmission, the fluid pressure sensors are not sold separately but are integrated into the main valve body assembly. As a result, a P0842 code on this vehicle, and its platform mates like the Dodge Caliber and Jeep Patriot, often requires the replacement of the entire transmission valve body rather than just a single, inexpensive sensor.

Symptoms You May Notice

• Check Engine Light is on
• Transmission warning light is on
• Vehicle enters 'limp mode' (stuck in one gear)
• Harsh, erratic, or delayed shifting
• Poor acceleration
• Increased fuel consumption
• Transmission overheating

Most Likely Causes

1. Failed Transmission Valve Body 🔴 High Probability → Shop Transmission Valve Body The fluid pressure sensors on the Jatco JF011E CVT are integrated into the valve body and are a known failure point. Fluid contamination can cause solenoids and valves within the body to stick or fail, but often the sensor electronics fail internally.
   How to confirm: After confirming fluid level is correct and wiring is intact, a diagnostic scan tool monitoring live data will show voltage from pressure sensor 'A' stuck low (e.g., under 0.25V) and not responding to changes in RPM or gear. This points to an internal sensor failure.
   Typical fix: Replace the entire transmission valve body assembly. A relearn or quick-learn procedure with a capable scan tool (like wiTECH for Chrysler/Jeep) is required after installation to ensure proper shift quality.
   Est. part cost: $150-$450
2. Low or Contaminated Transmission Fluid 🟡 Medium Probability → Shop Transmission Assembly CVTs are highly sensitive to fluid level and condition. The Jatco JF011E is known to have issues with overheating, which degrades the fluid more quickly. Using anything other than the specified Mopar CVTF+4 or an equivalent CVT fluid can cause pressure and performance issues.
   How to confirm: Check the transmission fluid level and condition via the dipstick. The fluid should be at the correct level and have a clear, translucent color. Dark, burnt-smelling fluid indicates overheating and degradation.
   Typical fix: Perform a transmission fluid drain and fill, or a full fluid exchange, using only the specified Mopar CVTF+4 fluid. It is also recommended to replace both the primary and secondary transmission filters at the same time.
   Est. part cost: $60-$150
3. Wiring Harness or Connector Issues ⚪ Low Probability
   How to confirm: Visually inspect the wiring harness leading to the transmission for any signs of damage, corrosion, or loose connections. A multimeter can be used to test for continuity and proper voltage at the transmission connector, following the vehicle's service manual.
   Typical fix: Repair the damaged section of the wire or replace the faulty connector. Ensure the connection is secure and protected from moisture.
   Est. part cost: $15-$75

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM) or Transmission Control Module (TCM): → Shop Engine Control Module (ECM) This is very rare and should only be considered after all other possibilities (sensor/valve body, fluid, wiring) have been exhaustively ruled out. The module would need to be tested by a specialist, and replacement requires programming to the vehicle.

Diagnosis Steps

1. Check the transmission fluid level and condition. Top off or replace if necessary using only Mopar CVTF+4 or equivalent CVT fluid.
2. Use a diagnostic scan tool to check for any other stored transmission codes. Note the P0842 code and any related faults.
3. Monitor live data from the Transmission Fluid Pressure Sensor 'A'. Note if the voltage is stuck low (typically under 0.25V) and does not change with engine RPM.
4. Inspect the external transmission wiring harness and connectors for any visible damage, corrosion, or loose pins. Pay close attention to the main connector at the transmission case.
5. If wiring appears intact, disconnect the harness and test the circuit for proper voltage and ground at the transmission connector using a digital multimeter and the vehicle's service manual for pinout diagrams.
6. If the fluid and external wiring are confirmed to be good, the fault is highly likely to be the internal pressure sensor, which is part of the valve body assembly.
7. Replace the transmission valve body.
🎬 See this full guide on replacing the JF011e transmission
8. After replacement, perform a transmission control module (TCM) 'Quick Learn' or 'Adaptation' procedure using a compatible scan tool to calibrate the new components.

Parts You'll Likely Need

• Transmission Valve Body (OEM #RL070618AA) — The fluid pressure sensors are integrated into the valve body on the Jatco CVT used in this vehicle. A sensor failure requires replacing the entire assembly. The part number for the full assembly is distinct from individual clips or components.
  Trusted brands: Mopar, Rostra, Sunbelt
  OEM price range: $400-$500
  Aftermarket price range: $150-$300
• Mopar CVTF+4 Transmission Fluid — The correct fluid is critical when servicing the transmission or replacing the valve body. Using incorrect fluid can cause damage.
  Trusted brands: Mopar
  OEM price range: $20-$30 per quart
• Transmission Filter Kit — When replacing the valve body, it is best practice to also replace the transmission fluid filters (both the pan filter and the cooler filter).
  Trusted brands: Mopar, Wix, Fram
  OEM price range: $40-$60
  Aftermarket price range: $20-$40

Related Codes That Often Appear With This One

• P0700 — P0700 is a generic code indicating that the Transmission Control Module (TCM) has stored a fault. It acts as a 'check engine light' for the transmission and will almost always accompany a specific transmission code like P0842.
• P0841 — This code indicates a 'Range/Performance' issue with the same pressure sensor circuit. It suggests the sensor is providing readings that are illogical or erratic for the current state, while P0842 points more directly to a persistent low voltage electrical circuit failure.
• P0746 — This code relates to the Pressure Control Solenoid 'A' Performance or Stuck Off. Since the pressure sensor and solenoids work together in the valve body, a failure in one area can sometimes trigger faults in another.

Technical Service Bulletins (TSBs) & Recalls

• TSB 21-013-14 / 21-013-16 / 21-013-21: While not directly for P0842, these bulletins address the critical 'Quick Learn' and adaptation procedures required after transmission service, such as replacing a valve body or reprogramming the TCM, to ensure proper shift quality.
• TSB 23-012-14: This TSB addresses inspection and replacement of front and rear crossmembers due to corrosion on 2007+ Compass models. While unrelated to the P0842 code, it is a critical safety issue for owners of these vehicles.

Platform-Specific Known Issues

• The OEM part number 68070622AA is often listed for this vehicle, but multiple sources indicate this is only for a small retaining clip, not the full valve body assembly. Buyers should be cautious and verify they are purchasing the complete valve body, not just a clip with a similar name.

Mechanic-Grade Diagnostic Values

• Transmission Fluid Pressure Sensor 'A' Voltage — expected: Varies with pressure, but should be above 0.25V with key on.. Failure: Voltage is 0.25V or less for 5.0 seconds or more.
• TCC Control Solenoid Resistance (on valve body) — expected: 3 to 9 ohms. Failure: Reading is outside of this range, indicating a faulty solenoid.
• Lockup Select Switch Solenoid Resistance (on valve body) — expected: 15 to 30 ohms. Failure: Reading is outside of this range, indicating a faulty solenoid.

Scan Tool Commands That Help

• wiTECH or equivalent advanced scan tool: CVT Quick Learn / Adaptation / Clear EEPROM — This is a mandatory procedure after replacing the transmission valve body. It calibrates the new solenoids and sensors to the TCM to ensure correct pressure control and shift quality. Failure to perform this step will result in poor transmission performance even with a new part.

Wiring & Ground Locations

• Transmission Control Module (TCM) — Inside the cabin, in the driver's side footwell, mounted up behind the dash near the brake pedal. It is accessed by removing the lower dash trim and kick panel.. The TCM receives the signal from the pressure sensor. A poor connection at the TCM is a possible, though less common, cause of the fault.
• G305 — In the driver's side left kick panel, near the TCM.. This is a primary ground point for the transmission control system on some model years (e.g., 2011). A corroded or loose ground here can cause various transmission electrical faults, including P0842.
• G301 — In the left side of the luggage compartment/trunk area.. On early models (e.g., 2007), this ground is associated with the 'Transmission solenoid/pressure switch assembly' circuit. A fault at this location could interrupt the sensor's ground path.
• PCM Connector C1, Pin A22 — At the main Powertrain Control Module connector in the engine compartment.. This pin provides the dedicated sensor ground (K915 circuit, Brown/White wire on a 2014 model) for multiple sensors. A pin fitment issue or corrosion here could affect the pressure sensor reading.

OEM Part Supersession History

• 68070618AA → RL070618AA — Part revision or remanufactured part update from Mopar.
  Heads up: The original part number 68070618AA appears to be for 2007-2012 models, while RL070618AA is the correct replacement for all 2007-2017 models, ensuring compatibility.

Model Year Variations Within This Range

• 2007-2017: The specific location of chassis ground points for the transmission control system can vary. For example, a 2007 model may use ground G301 in the luggage compartment, while a 2011 model uses G305 in the driver's kick panel. Always consult the correct wiring diagram for the specific model year being serviced.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Front and Rear Subframe Corrosion 🔴 High — Very common, especially in salt-belt regions. Can become structurally unsafe. A warranty extension was issued but has expired for most vehicles. (Ref: TSB 23-012-14)
• Water Leaks into Cabin 🟠 Medium — Commonly caused by clogged sunroof drains or failed seam sealer, leading to wet carpets and potential electrical issues. (Ref: TSB 23-005-13)
• Totally Integrated Power Module (TIPM) Failure 🔴 High → Shop Fuse Box — Common in earlier models (approx. 2007-2012). Can cause a wide range of bizarre electrical problems, including no-start conditions or the fuel pump running continuously.
• Premature Failure of Suspension Components 🟠 Medium — Lower control arm bushings, ball joints, and struts are known to wear out prematurely, leading to alignment problems, noise, and poor ride quality.
• Crankshaft/Camshaft Position Sensor Connector Failure 🟠 Medium — A recall was issued for some 2016 models where improperly manufactured connectors could cause the engine to stall. (Ref: Recall)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used valve body from a junkyard or recycler is a reasonable, cost-saving option for this repair, as the failure is electronic and not always tied to mechanical wear. The high cost of a new OEM part makes a used unit an attractive alternative.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Source from a vehicle with the lowest possible mileage.
• If possible, verify the donor vehicle was not involved in a severe front-end collision that could have shocked the transmission.
• Inspect the electrical connector pins on the used valve body for any signs of corrosion, moisture, or overheating (discoloration).
• Ask for the VIN of the donor vehicle to check its service history if the recycler provides it.

OEM-only on this vehicle (don't cheap out):

• Mopar CVTF+4 Transmission Fluid. CVTs are extremely sensitive to fluid type, and using non-specified fluid is a major risk for causing performance issues or damage.

Aftermarket brands forum-validated for this vehicle:

• Rostra
• Sunbelt

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0700 — Transmission Control System (MIL Request). This is a general code indicating the Transmission Control Module (TCM) has detected a fault, such as P0842, and has requested the Check Engine Light be turned on.
• P0843 — Transmission Fluid Pressure Sensor 'A' Circuit High. This is the direct companion code to P0842, indicating the sensor voltage is stuck high instead of low, often due to the same sensor or wiring failure.
• P0776 — Pressure Control Solenoid 'B' Performance or Stuck Off. The context mentions that fluid contamination can cause solenoids within the valve body to stick or fail, which would trigger this code alongside a pressure sensor fault.
• P0847 — Transmission Fluid Pressure Sensor 'B' Circuit Low. This code points to a failure of the secondary pressure sensor. Since the sensors are a known failure point and are housed in the same valve body, it's common for both to be susceptible to failure.
• P0741 — Torque Converter Clutch Circuit Performance or Stuck Off. Incorrect fluid pressure readings from a faulty sensor can prevent the TCM from properly commanding the torque converter clutch, leading to this code.

Frequently Asked Questions