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1998 Dodge Ram 5.9L - Loss of Power During Right Turns with Codes P0320 and P0740

Model: 1998 Dodge 5.9 Fault Code: P0320 Posted: 2012-10-16 23:02

While driving with a friend in his 1998 Dodge Ram 5.9L (approximately 200,000 miles), the vehicle experiences a sudden loss of power to the wheels specifically during and immediately after a right-hand turn. The engine idle and overall power are normal, and transmission shifting appears fine. The truck previously underwent a transmission rebuild (out of warranty) several years ago, and the owner reports that the transmission has been slipping only during right turns—this issue has persisted for some time. Diagnostic trouble codes retrieved include P0320 and P0740. While P0320 is likely related to a misfire and may be addressed separately, P0740 (Transmission Fluid Pressure Control Circuit Malfunction) appears to be the primary concern. This code suggests potential issues with transmission fluid pressure regulation, which could directly explain the loss of drive power during turns. I'm seeking expert advice on how to diagnose and resolve this issue—particularly whether the P0740 code is linked to the turning-related power loss. Any insights into possible causes, troubleshooting steps, or repair recommendations would be greatly appreciated.

Related fault codes
P0320P0740
Comments (2)
Anonymous 2012-10-17 11:27

Can your OBD2 scanner read P1xxx codes? Do you have access to freeze frame data from the vehicle's diagnostic memory? What transmission model is it—42 or 46 series? Also, does the vehicle feel like it’s in neutral during right turns? Suggested steps: - Check transmission fluid level and condition. - Drain and replace the transmission filter. - Inspect all sealing areas around the transmission pan and gaskets. - Ensure you use the correct type of transmission fluid specified for your 1998 Dodge Ram 5.9L model.

Anonymous 2012-10-21 16:24

My scanner supports P1xxx codes but does not provide freeze frame data (it's a basic, budget-friendly device). I'm still verifying the transmission type—will confirm that soon. The issue occurs during left-hand turns, not right-hand turns, which may affect the diagnosis. Currently, the main concern has shifted to driveability and a new P1391 code, which I've started discussing in another post. Thank you for your helpful input.