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2022 Ram 1500 - Transmission Shifting Hard, Limp Mode, P0700

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Mike T. · rep 0 · May 25, 2:26 AM · 1 replies · solved · Question

Vehicle: 2022 Ram 1500 Big Horn

My 2022 Ram 1500 Big Horn with the 3.6L Pentastar V6 and 8-speed automatic transmission has suddenly started acting up. Yesterday, while driving, it shifted very harshly into gear and then felt like it was stuck in a higher gear. The Check Engine Light came on, and the truck went into what I believe is limp mode, limiting speed and power.

I scanned it and got a P0700 code, which I know is a generic transmission control system malfunction. What could be causing this? Is my transmission toast, or could it be something simpler like a sensor? The truck only has 45,000 miles.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:26 AM

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ClearTheCode admin answer:

  1. Understanding P0700 and Limp Mode: P0700 is a general diagnostic trouble code indicating that the Transmission Control Module (TCM) has detected a fault within the transmission system and has illuminated the Check Engine Light. When your truck goes into 'limp mode,' it's the TCM's way of protecting the transmission from further damage by limiting available gears and engine power.

  2. Initial Diagnostic Steps:

    • Check Transmission Fluid Level and Condition: This is crucial. Park on a level surface, warm up the engine, and follow your owner's manual for checking the transmission fluid. Look for proper level, color (should be reddish, not dark brown or black), and smell (burnt smell indicates serious issues).
    • Scan for Secondary Codes: The P0700 is a 'request' code from the TCM to the PCM. A more advanced scanner (or a visit to a shop) can pull the specific 'Pxxxx' codes stored within the TCM, which will pinpoint the exact fault (e.g., solenoid issues, sensor failures, pressure problems).
    • Inspect Wiring and Connectors: Visually check the transmission's external wiring harness and connectors for any signs of damage, corrosion, or loose connections.

  3. Common Causes for P0700 and Limp Mode:

    • Low or contaminated transmission fluid.
    • Faulty transmission speed sensors (input or output).
    • Issues with transmission solenoids (e.g., shift solenoids, pressure control solenoids).
    • Internal transmission mechanical failure (e.g., clutch packs, valve body).
    • Faulty Transmission Control Module (TCM) itself.
    • Wiring harness issues to the TCM or transmission components.

  4. When to See a Professional Shop:

    • Immediately, if the truck is in limp mode and you cannot safely drive it. Continued driving in limp mode can exacerbate internal damage.
    • If the transmission fluid is low, dark, or smells burnt, indicating potential internal wear.
    • If you cannot access the specific transmission fault codes (beyond P0700) with your scanner.
    • Any time an automatic transmission exhibits hard shifting or enters limp mode, it's best to have it professionally diagnosed to prevent more costly repairs down the line.
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