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A Ram diesel running only short city trips can't complete its own regeneration cycle, showing up as a warning light, rough idle, or reduced power. On 5.7 Hemi gas trucks, a ticking exhaust note usually means loose or broken manifold bolts, not a bottom-end problem. Current hours: Mon–Sat 9:00 AM – 6:00 PM, closed Sun.
A diesel Ram that spends its life doing short errands around the city — a few miles to a job site, a few miles back, repeat — never gets the sustained highway run its emissions system needs to burn off the soot it collects. That shows up as a dashboard warning, a rougher idle than usual, or a noticeable drop in power that oddly clears up after a longer drive. It isn't a sign the truck is failing; it's the truck asking for a regeneration it hasn't been able to finish on its own, and it's one of the more common reasons a diesel Ram ends up here rather than parked at a dealer's service counter.
The gas trucks have their own, unrelated tell: a ticking or tapping sound from the engine bay, most noticeable cold and easing off as it warms up. On the 5.7 Hemi, that's often the exhaust manifold bolts working loose or snapping — a known weak point on this engine, not a sign the engine itself is going.
Can I fix the regeneration problem myself?
A sustained highway drive sometimes lets the truck complete the cycle on its own and clears the warning without a shop visit at all. If it doesn't clear, or it comes back within days of normal driving, that usually points to a sensor or the filter itself needing attention rather than more miles behind the wheel — and driving around a real filter problem tends to make the eventual repair more expensive, not less.
What actually happens during a manifold bolt repair?
Loose or snapped manifold bolts don't fix themselves, and driving on a leaking manifold long enough can crack it — turning a straightforward bolt job into a manifold replacement.
- the manifold comes off to reach the bolts, since they sit against the block
- any snapped bolts get extracted, not just the ones still intact
- new bolts go in with the correct torque sequence so they don't work loose the same way again
- the manifold itself gets inspected for cracking before it goes back on
Is the ticking noise dangerous to drive on?
Not immediately — a manifold bolt tick is an exhaust leak, not an engine failure, and most Ram owners drive on it for a while before bringing it in. It's worth fixing before it cracks the manifold, which turns a bolt repair into a more expensive manifold swap.
Why does the check-engine light come back after I clear it?
Because clearing the code doesn't fix the underlying issue — if the truck still can't complete a regeneration cycle on typical city driving, the light returns within a few days of driving the same way. That's the signal it needs an actual look rather than another reset.
Does this happen to gas Rams too, or just diesels?
The regeneration issue is diesel-specific — it doesn't apply to gas trucks at all. The manifold bolt tick runs the other way: it's a 5.7 Hemi gas-engine issue that diesel Rams don't share.
How do I book a diagnostic?
Call (628) 444-4559 to set one up. Current hours: Mon–Sat 9:00 AM – 6:00 PM, closed Sun.