1998 Chevrolet Gmt 400 problems

Common 1998 Chevrolet Gmt 400 problems

Based on the information from the sources provided, here are some common problems with the Chevrolet GMT-400 1998 based on complaints from owners:

1. Windshield Wiper Motor Component Failure:
   • Windshield wipers may stop working intermittently due to a defective wiper motor control board. This issue can cause the wipers to stop working, fail to turn on, or keep running after being turned off. A temporary fix involves lightly tapping on the control box, but a more permanent solution is to replace the wiper motor control board.
2. Coolant Leaks or Oil Leaks From Intake Manifold Gaskets:
   • Intake manifold gaskets in 1988-1998 GMCK pickup trucks can develop external engine oil or coolant leaks. Internal coolant leaks may also occur, leading to coolant mixing with engine oil, potentially damaging the engine. To fix this issue, the intake manifold gasket needs replacement, which typically costs between $300 and $450.
3. Front Wheel Speed Sensor Failure:
   • Front wheel speed sensors or anti-lock brake system (ABS) sensors may fail, causing the ABS warning light to turn on or the ABS to activate erratically. This issue can lead to ABS activation on dry roads at slow speeds, affecting the vehicle's braking system.
4. Restricted Secondary Air Injection Valves:
   • Silverados and Sierras made between 1999 and 2007 are prone to issues with secondary air injection check valves, leading to reduced airflow and triggering the check engine light. Resolving this problem involves replacing the check valves, which may cost between $100 and $150 per valve.
5. Failed Steering Wheel Position Sensor:
   • If a service stability message appears in your Silverado or Sierra, it could be due to a failed steering wheel position sensor. This issue may occur intermittently or regularly, especially when starting the truck or turning the wheel. Replacing the sensor, costing about $200 to $300, should address this problem.

These common problems highlight key issues that Chevrolet GMT-400 1998 owners may face, ranging from wiper motor failures to sensor malfunctions and leaks. Addressing these issues promptly can help maintain the vehicle's performance and safety.